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An extensional definition possesses similarity to an [[ostensive definition]], in which one or more members of a set (but not necessarily all) are pointed to as examples, but contrasts clearly with an [[intensional definition]], which defines by listing properties that a thing must have in order to be part of the set captured by the definition.
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The terms "[[intension]]" and "[[Extension (semantics)|extension]]" were introduced before 1911 by [[Constance Jones]]<ref>{{cite web
| title =Emily Elizabeth Constance Jones: Observations on Intension and Extension
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