[ noun ] what you must know in order to determine the reference of an expression <noun.communication>
Intension \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.