Grammar. a word, especially an adverb, or other linguistic element that indicates, and usually increases, the degree of emphasis or force to be given to the element it modifies, as very or somewhat; intensive adverb.
a ram-operated device for increasing hydraulic pressure.
a word, esp an adjective or adverb, that has little semantic content of its own but that serves to intensify the meaning of the word or phrase that it modifies: awfully and up are intensifiers in the phrases awfully sorry and cluttered up
a substance, esp one containing silver or uranium, used to increase the density of a photographic film or plate Compare reducer (sense 1)