noun
Technical term in logic and semantics referring to the set of all things a concept applies to. Contrasts with 内包 (intension/connotation).
「犬」の外延には、チワワもセントバーナードも含まれる。
The extension of 'dog' includes both Chihuahuas and Saint Bernards.
外延と内包の区別は、意味論の基本
The distinction between extension and intension is fundamental in semantics.