Jisho

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Noun
1. extension; denotation
Wikipedia definition
2. Extension (semantics)In any of several studies that treat the use of signs - for example, in linguistics, logic, mathematics, semantics, and semiotics - the extension of a concept, idea, or sign consists of the things to which it applies, in contrast with its comprehension or intension, which consists very roughly of the ideas, properties, or corresponding signs that are implied or suggested by the concept in question.
Read “Extension (semantics)” on English Wikipedia
Read “外延” on Japanese Wikipedia
Read “Extension (semantics)” on DBpedia

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