A number that is not an integer.

(mathematical analysis, singular only, definite and countable) An integral which has more general application than that of the Riemann integral, because it allows the region of integration to be partitioned into not just intervals but any measurable sets for which the function to be integrated has a sufficiently narrow range. (Formal definitions can be found at PlanetMath).

Alternative form of internal combustion engine

(espionage) Any resource by means of which intelligence is gathered.

Used to indicate acknowledgment that what one has just said, or what one is about to say, could be viewed as a pun, but was/is not used as a pun. Equally as often the term is used in conversation to call attention to an intended pun.

plural of intelligence agency

(psychology) The capacity to think logically and solve problems in novel situations, independent of acquired knowledge.

plural of internal rhyme

plural of integral function

(electronics) an integration type for digital circuits that contain transistors numbering in the tens providing a few logic gates per chip