Within No True
When Is Redefinition Not a Fallacy?
Some exclusions are not evasions because the boundary is built into law, credentials, rules, or ordinary usage.
On this page
- Legal and credential based boundaries
- Ordinary usage and shared criteria
- Strict standards versus ad hoc exclusions
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Introduction
Not every change in a definition is a No True Scotsman fallacy. Sometimes a group really does have membership rules, legal boundaries, professional qualifications, or widely shared criteria that determine who belongs and who does not. The key question is not whether a definition becomes narrower, but whether the boundary is justified independently of the argument being defended. When the criteria exist before the dispute, can be applied consistently, and are not invented solely to escape a counterexample, redefining a group may be legitimate rather than fallacious. [Wikipedia]WikipediaNo true ScotsmanNo true Scotsman [scribbr]scribbr.comno true scotsman fallacyScribbrNo True Scotsman Fallacy | Definition & ExamplesJun 5, 2023 — The no true Scotsman fallacy is the attempt to defend a generalizati… Within debates about logical fallacies, this distinction matters because definitions serve two different purposes. They can clarify what a term means, or they can be manipulated to protect a claim from evidence. The difference lies in the source, timing, and consistency of the criteria being used. [Fallacy Files]fallacyfiles.orgFallacy FilesThe No-True-Scotsman FallacyThe "no-true-Scotsman" type of redefinition usually occurs in the course of an argument or debat… [Logically Fallacious]logicallyfallacious.comLogically Fallacious How to Spot the No True Scotsman FallacyHow to Spot the No True Scotsman Fallacy16 May 2026 — The No True Scotsman fallacy happens when someone responds to a counterexample by r…
Legal and Credential-Based Boundaries
One of the clearest cases of legitimate redefinition occurs when membership is determined by formal rules rather than personal preference.
A person is not a licensed physician simply because they practise medicine-like activities. In most jurisdictions, legal status depends on meeting licensing requirements established by government agencies or professional regulators. Similarly, a lawyer, accountant, engineer, or other regulated professional may lose the right to claim that status if licensing conditions are not met. These boundaries are not created during an argument; they exist independently and can be checked against published standards. [Contentful]assets.ctfassets.netContentful Licensing CredentialingContentfulLicensing CredentialingJuly 27, 2023 — Licensing and credentialing ensures patient safety by verifying that you, as a medical p… [2lawsociety.bc.ca]lawsociety.bc.caFurlong Report A Competence Based System for Lawyer Licensing in BCA Competence-Based System For Lawyer Licensing in…10 May 2022 — The Law Society might soon have a mandate to set licensing and compete…
Consider the difference between two statements:
- “No true doctor would make that mistake.”
- “This person is not a licensed doctor because they do not hold the required licence.”
The first risks becoming a No True Scotsman argument if “true doctor” merely means “a doctor who behaves correctly”. The second relies on an external credentialing system that defines membership before the dispute arises. [Wikipedia]WikipediaNo true ScotsmanNo true Scotsman
Professional regulation exists precisely because societies create recognised standards for entry and continued membership. Licensing and credentialing systems verify qualifications, competence, and compliance with professional requirements. Whether those standards are wise or effective can be debated, but their existence provides a non-ad hoc basis for determining who belongs to the group. [PubMed Central]pmc.ncbi.nlm.nih.govPMCby O Gershuni · 2023 · Cited by 42 — The review presents specific professional regulation and credentialing approaches without favorin… [Contentful]assets.ctfassets.netContentful Licensing CredentialingContentfulLicensing CredentialingJuly 27, 2023 — Licensing and credentialing ensures patient safety by verifying that you, as a medical p…
Ordinary Usage and Shared Criteria
Legitimate redefinition can also occur in everyday language when a discussion reveals that participants are using different meanings of the same term.
Definitions are not always fixed by law. Many categories depend on ordinary usage and shared understanding. Philosophers of language have long noted that definitions help establish what a discussion is actually about. Clarifying a disputed term is often necessary before evidence can be evaluated properly. [stanford]plato.stanford.eduEncyclopedia of Philosophy DefinitionsPlato's early dialogues portray Socrates raising questions about definitions.Read more… Encyclopedia of Philosophy
For example, imagine a discussion about whether a particular vehicle counts as a motorcycle. Participants may consult statutory definitions, industry standards, or common usage. If the conversation concludes that the vehicle falls outside the accepted category, that is not automatically a fallacy. The category boundary existed independently of the immediate dispute.
The important distinction is that the criteria apply across cases. A legitimate definition should classify both favourable and unfavourable examples using the same standard. If a boundary excludes only the inconvenient counterexample while leaving everything else untouched, suspicion is warranted. If the same rule would also exclude examples that support the speaker’s position, the definition is more likely to be genuine. Reddit [Fallacy Files]fallacyfiles.orgFallacy FilesThe No-True-Scotsman FallacyThe "no-true-Scotsman" type of redefinition usually occurs in the course of an argument or debat…
How to Tell the Difference
A practical way to distinguish fair redefinition from a No True Scotsman move is to ask a series of questions.
Was the criterion established before the counterexample appeared?
Definitions that pre-date the disagreement are generally more credible than definitions introduced only after a challenge. The classic fallacy involves an after-the-fact adjustment designed to save a claim. [Wikipedia]WikipediaNo true ScotsmanNo true Scotsman [Logically Fallacious]logicallyfallacious.comLogically Fallacious How to Spot the No True Scotsman FallacyHow to Spot the No True Scotsman Fallacy16 May 2026 — The No True Scotsman fallacy happens when someone responds to a counterexample by r…
Can the criterion be applied consistently?
A legitimate boundary should produce predictable results across multiple cases. If membership changes depending on who is being discussed, the definition is functioning as a rhetorical shield rather than a genuine standard. [Reddit]reddit.comRedditWhy is No True Scotsman a fallacy?: r/askphilosophyThe idea of the No True Scotsman is that it ad hoc revises a claim that is, str…
Is there an independent authority or shared practice behind it?
Legal classifications, organisational membership rules, professional licences, and long-established technical definitions often provide objective criteria. Personal preferences usually do not. [Contentful]assets.ctfassets.netContentful Licensing CredentialingContentfulLicensing CredentialingJuly 27, 2023 — Licensing and credentialing ensures patient safety by verifying that you, as a medical p… [2lawsociety.bc.ca]lawsociety.bc.caFurlong Report A Competence Based System for Lawyer Licensing in BCA Competence-Based System For Lawyer Licensing in…10 May 2022 — The Law Society might soon have a mandate to set licensing and compete…
Does the definition help explain reality or avoid it?
A useful definition clarifies the discussion and improves understanding. A fallacious redefinition mainly serves to protect a sweeping claim from falsification. [Scribbr]scribbr.comno true scotsman fallacyScribbrNo True Scotsman Fallacy | Definition & ExamplesJun 5, 2023 — The no true Scotsman fallacy is the attempt to defend a generalizati… [Logical Fallacy]logical-fallacy.comLogical Fallacy No True ScotsmanNo True Scotsman - Definition and Examples - Logical Fallacy21 Sept 2024 — The “No True Scotsman” logical fallacy is a common rhetorical…
Strict Standards Versus Ad Hoc Exclusions
The most difficult cases arise when a group has genuine standards or ideals.
Religious traditions, political movements, professions, and philosophical schools often maintain normative commitments. A person may argue that a particular action violates the movement’s principles. That claim is not automatically fallacious. Saying that a member acted contrary to the group’s stated values differs from saying that the member was never really part of the group. [Scribbr]scribbr.comno true scotsman fallacyScribbrNo True Scotsman Fallacy | Definition & ExamplesJun 5, 2023 — The no true Scotsman fallacy is the attempt to defend a generalizati…
For example:
- “This member violated the organisation’s code of conduct” is a claim about behaviour relative to established standards.
- “Anyone who violates the code was never a real member” may become a No True Scotsman argument if the exclusion is invented only to preserve a universal claim about members’ behaviour. [Wikipedia]WikipediaNo true ScotsmanNo true Scotsman [Fallacy Files]fallacyfiles.orgFallacy FilesThe No-True-Scotsman FallacyThe "no-true-Scotsman" type of redefinition usually occurs in the course of an argument or debat…
The difference often turns on whether membership rules already include expulsion criteria. If an organisation’s constitution specifies that certain actions terminate membership, invoking that rule is not a fallacy. If the rule appears only after a damaging counterexample emerges, the move becomes much harder to justify. [Molina Healthcare]molinahealthcare.comMolina Healthcare Section 12Credentialing and RecredentialingPractitioner must not have been convicted of a felony or pled guilty to a felony for a healthcare relate…
Why This Distinction Matters
Treating every definitional dispute as a No True Scotsman fallacy would make meaningful classification impossible. Law, science, professional practice, and ordinary communication all depend on drawing boundaries between categories. At the same time, allowing definitions to change whenever a counterexample appears would make claims immune to evidence.
The governing principle is consistency. Legitimate redefinition relies on criteria that are independent, publicly understandable, and applicable before the argument begins. Fallacious redefinition creates criteria only when they are needed to rescue a threatened claim. The presence of a boundary is not the problem; the problem is a boundary that moves whenever the evidence arrives. Reddit [Wikipedia]WikipediaNo true ScotsmanNo true Scotsman [Scribbr]scribbr.comno true scotsman fallacyScribbrNo True Scotsman Fallacy | Definition & ExamplesJun 5, 2023 — The no true Scotsman fallacy is the attempt to defend a generalizati…
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Further Reading
Books and field guides related to When Is Redefinition Not a Fallacy?. Use these as the next step if you want deeper reading beyond the article.
How to Win Every Argument
Discusses legitimate versus illegitimate argumentative moves.
An Illustrated Book of Bad Arguments
Provides context for recognizing definitional fallacies.
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Endnotes
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Source: Wikipedia
Title: No true Scotsman
Link: https://en.wikipedia.org/wiki/No_true_Scotsman -
Source: scribbr.com
Title: no true scotsman fallacy
Link: https://www.scribbr.com/fallacies/no-true-scotsman-fallacy/Source snippet
ScribbrNo True Scotsman Fallacy | Definition & ExamplesJun 5, 2023 — The no true Scotsman fallacy is the attempt to defend a generalizati...
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Source: reddit.com
Link: https://www.reddit.com/r/askphilosophy/comments/1db4k07/why_is_no_true_scotsman_a_fallacy/Source snippet
RedditWhy is No True Scotsman a fallacy?: r/askphilosophyThe idea of the No True Scotsman is that it ad hoc revises a claim that is, str...
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Source: plato.stanford.edu
Title: Encyclopedia of Philosophy Definitions
Link: https://plato.stanford.edu/entries/definitions/Source snippet
Plato's early dialogues portray Socrates raising questions about definitions.Read more...
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Source: lawsociety.bc.ca
Title: Furlong Report A Competence Based System for Lawyer Licensing in BC
Link: [https://www.lawsociety.bc.ca/getContentAsset/676ef5e8-b9dd-4c60-ba67-3b02220a7ffd/dfc3d011-8f63-43f6-9ed8-4b444333a1d0/Furlong_Report_-A_Competence-Based_System_for_Lawyer_Licensing_in_BC.pdf?language=en-CA](https://www.lawsociety.bc.ca/getContentAsset/676ef5e8-b9dd-4c60-ba67-3b02220a7ffd/dfc3d011-8f63-43f6-9ed8-4b444333a1d0/Furlong_Report-_A_Competence-Based_System_for_Lawyer_Licensing_in_BC.pdf?language=en-CA)Source snippet
A Competence-Based System For Lawyer Licensing in...10 May 2022 — The Law Society might soon have a mandate to set licensing and compete...
Published: May 2022
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Source: plato.stanford.edu
Title: Encyclopedia of Philosophy Fallacies
Link: https://plato.stanford.edu/entries/fallacies/Source snippet
Stanford Encyclopedia of PhilosophyFallacies - Stanford Encyclopedia of Philosophyby H Hansen · 2015 · Cited by 427 — Two competing conce...
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Source: logical-fallacy.com
Title: Logical Fallacy No True Scotsman
Link: https://www.logical-fallacy.com/articles/no-true-scotsman/Source snippet
No True Scotsman - Definition and Examples - Logical Fallacy21 Sept 2024 — The “No True Scotsman” logical fallacy is a common rhetorical...
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Source: reddit.com
Link: https://www.reddit.com/r/NoStupidQuestions/comments/17od10y/why_is_no_true_scotsman_considered_a_logical/Source snippet
Why is "No True Scotsman" considered a logical fallacy?In an argument, there can be a "True Scotsman", and a "No True Scotsman"...
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Source: youtube.com
Title: Logical Fallacies
Link: https://www.youtube.com/watch?v=bvTS9Jw2JDMSource snippet
The Motte and Bailey Fallacy...
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Source: fallacyfiles.org
Link: https://www.fallacyfiles.org/scotsman.htmlSource snippet
Fallacy FilesThe No-True-Scotsman FallacyThe "no-true-Scotsman" type of redefinition usually occurs in the course of an argument or debat...
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Source: logicallyfallacious.com
Title: Logically Fallacious How to Spot the No True Scotsman Fallacy
Link: https://www.logicallyfallacious.com/blog/how-to-spot-the-no-true-scotsman-fallacySource snippet
How to Spot the No True Scotsman Fallacy16 May 2026 — The No True Scotsman fallacy happens when someone responds to a counterexample by r...
Published: May 2026
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Source: assets.ctfassets.net
Title: Contentful Licensing Credentialing
Link: https://assets.ctfassets.net/7b49qn4tvor3/2wlw55ETjAQTJevkryEwW0/72314a96333e7b8823dde202ab357584/Whitepaper-L_C_101_FINAL.pdfSource snippet
ContentfulLicensing CredentialingJuly 27, 2023 — Licensing and credentialing ensures patient safety by verifying that you, as a medical p...
Published: July 27, 2023
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Source: pmc.ncbi.nlm.nih.gov
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC10002239/Source snippet
PMCby O Gershuni · 2023 · Cited by 42 — The review presents specific professional regulation and credentialing approaches without favorin...
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Source: molinahealthcare.com
Title: Molina Healthcare Section 12
Link: https://www.molinahealthcare.com/providers/oh/marketplace/manual/PDF/12%20Credentialing.pdfSource snippet
Credentialing and RecredentialingPractitioner must not have been convicted of a felony or pled guilty to a felony for a healthcare relate...
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Source: quillbot.com
Title: no true scotsman fallacy
Link: https://quillbot.com/blog/reasoning/no-true-scotsman-fallacy/Source snippet
Examples & DefinitionJun 25, 2024 — The no true Scotsman fallacy attempts to protect a generalization from being falsified by spuriously...
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Source: diplomacy.edu
Title: No true Scotsman
Link: https://www.diplomacy.edu/blog/no-true-scotsman/Source snippet
Diplo25 Jun 2018 — The text discusses the "No-true-Scotsman" fallacy, which involves defending a generalization by dismissing counter-exa...
Additional References
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Link: https://study.com/academy/lesson/no-true-scotsman-fallacy-in-philosophy.htmlSource snippet
No True Scotsman Fallacy in PhilosophyThe No True Scotsman (NTS) fallacy is an error in logic wherein one person defends a generalization...
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Source: researchgate.net
Link: https://www.researchgate.net/publication/378921623_Credentialism_by_Members_of_Licensed_Professions -
Source: mololamken.com
Link: https://www.mololamken.com/assets/htmldocuments/The%20Watchman%20for%20Truth_%20Professional%20Licensing%20and%20the%20First%20Amendment.pdfSource snippet
y fall outside the protection of the First Amendment because they have material nonexpressive...Read more...
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Source: danmickle.com
Title: Logical Fallacies Series: No True Scotsman
Link: https://www.danmickle.com/logical-fallacies-series-no-true-scotsman/Source snippet
May 24, 2025 — The No True Scotsman fallacy happens when someone changes the definition of a group or concept to avoid disproving their a...
Published: May 24, 2025
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Source: briantubbs.medium.com
Title: the no true scotsman fallacy a2ec0aafe548
Link: https://briantubbs.medium.com/the-no-true-scotsman-fallacy-a2ec0aafe548Source snippet
“No True Scotsman” Fallacy - Brian Tubbs - MediumThe No True Scotsman Fallacy is when a person dismisses an example (or counterexample)...
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Source: facebook.com
Link: https://www.facebook.com/answerscanada/videos/what-counts-as-a-no-true-scotsman-fallacy/388720536291391/Source snippet
mething; for instance, no true scientist would reject evolution...
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Source: thoughtco.com
Title: the no true scotsman fallacy 250339
Link: https://www.thoughtco.com/the-no-true-scotsman-fallacy-250339Source snippet
Understanding the "No True Scotsman" FallacyNov 5, 2019 — It's a common statement used in debating or concluding a particular point that...
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Source: answersingenesis.org
Title: logical fallacies no true scotsman
Link: https://answersingenesis.org/blogs/patricia-engler/2021/02/03/logical-fallacies-no-true-scotsman/?srsltid=AfmBOoqdohZp-ghUZBMvhBb7zoywHQ3OICN4V8bSTVtIo_0E0TippvB2Source snippet
Logical Fallacies: No True ScotsmanFeb 3, 2021 — “No true Scotsman” fallacies happen when someone tries to win an argument by changing th...
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Source: yourlogicalfallacyis.com
Link: https://yourlogicalfallacyis.com/no-true-scotsmanSource snippet
criticisms or flaws of your argument.Read more...
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Source: cdn.vanderbilt.edu
Title: Licensing Knowledge
Link: https://cdn.vanderbilt.edu/vu-wordpress-0/wp-content/uploads/sites/278/2019/03/19115927/Licensing-Knowledge.pdfSource snippet
Knowledgeby CE Haupt · Cited by 51 — When professionals give advice, they disseminate professional knowledge to their clients. Profession...
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