What does extensional mean?

Definitions for extensional

This dictionary definitions page includes all the possible meanings, example usage and translations of the word extensional.

Princeton's WordNet

  1. extensionaladjective

    defining a word by listing the class of entities to which the word correctly applies


  1. extensionaladjective

    Of or pertaining to extension.

  2. extensionaladjective

    Having great extent.


  1. extensional

    In any of several fields of study that treat the use of signs — for example, in linguistics, logic, mathematics, semantics, semiotics, and philosophy of language — an extensional context (or transparent context) is a syntactic environment in which a sub-sentential expression e can be replaced by an expression with the same extension and without affecting the truth-value of the sentence as a whole. Extensional contexts are contrasted with opaque contexts where truth-preserving substitutions are not possible. Take the case of Clark Kent, who is secretly Superman. Suppose that Lois Lane fell out of a window and Superman caught her. Thus the sentence "Superman caught Lois Lane" is true. Because this sentence is an extensional context, the sentence "Clark Kent caught Lois Lane" is also true. Anybody that Superman caught, Clark Kent caught. In opposition to extensional contexts are intensional contexts (which can involve modal operators and modal logic), where terms cannot be substituted without potentially compromising the truth-value. Suppose that Lois Lane believes that Clark Kent will investigate a news story with her. Thus, the sentence "Lois Lane believes that Clark Kent will investigate a news story with her" is true. However, the statement, "Lois Lane believes that Superman will investigate a news story with her," is false. This is because 'believes' typically induces an intensional context. Lois Lane doesn't believe that Superman is Clark Kent and the propositional attitude "believe" induces an intensional context, so the substitution alters the meaning of the original sentence.


  1. extensional

    Extensional refers to concepts, theories, or philosophies that are based on the external, observable, and tangible properties or characteristics of things, rather than their internal, abstract, or theoretical qualities. This includes the belief that the meaning or identity of an object, word, or concept is determined by the elements or items that exist within it or are associated with it. Essentially, it is focused on what is demonstrable and verifiable.

Webster Dictionary

  1. Extensionaladjective

    having great extent

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How to say extensional in sign language?


  1. Chaldean Numerology

    The numerical value of extensional in Chaldean Numerology is: 8

  2. Pythagorean Numerology

    The numerical value of extensional in Pythagorean Numerology is: 3

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"extensional." Definitions.net. STANDS4 LLC, 2024. Web. 12 Jul 2024. <https://www.definitions.net/definition/extensional>.

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    take away to an undisclosed location against their will and usually in order to extract a ransom
    A abduct
    B embellish
    C affront
    D render

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