Meanings
nounextensionality (usually uncountable, plural extensionalities)
plural extensionalities
- uncountableusuallyhuman sciencesThe principle that objects are equal if and only if their observed properties are the same, regardless of internal processes that lead to those properties.
- uncountableusuallyfunctional analysisThe principle that functions are equal if and only if they operate on the same domain and for any given element of the domain the result of each of the functions is the same.
- uncountableusuallymathematicsThe principle, codified in the axiom of extensionality, that sets are equal if and only if they contain the same elements.
Origin
Translations
Polish ekstensjonalność, rozszerzalność
- ekstensjonalnośćthe principle of distinguishing only by externally observable properties
- rozszerzalnośćthe principle of distinguishing only by externally observable properties
- rozciągliwośćthe principle of distinguishing only by externally observable properties
Cite this entry
APA
extensionality. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/extensionality
MLA
“extensionality.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/extensionality. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “extensionality,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/extensionality.
Source: extensionality on Wiktionary, CC BY-SA 4.0.