/ Dictionary / Index I infestation: Meaning and Definition of Find definitions for: in•fes•ta•tion Pronunciation: (in"fe-stā'shun), [key] — n. the act of infesting; state of being infested. a harassing or troublesome invasion: an infestation of ants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: infestation (Thesaurus) infest infibulation Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language