Logic. (of a term) the set of attributes belonging to all and only those things to which the given term is correctly applied; connotation; comprehension. Compare extension(def. 12).
[Origin: 1595–1605; < L inténsiōn- (s. of inténsiō). See intense, -ion]
In*ten"sion\, n. [L. intensio: cf. F. intension. See Intend, and cf. Intention.]1. A straining, stretching, or bending; the state of being strained; as, the intension of a musical string. 2. Increase of power or energy of any quality or thing; intenseness; fervency. --Jer. Taylor. Sounds . . . likewise do rise and fall with the intension or remission of the wind. --Bacon. 3. (Logic & Metaph.) The collective attributes, qualities, or marks that make up a complex general notion; the comprehension, content, or connotation; -- opposed to extension, extent, or sphere. This law is, that the intension of our knowledge is in the inverse ratio of its extension. --Sir W. Hamilton.
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