/ Dictionary / Index I insulation: Meaning and Definition of Find definitions for: in•su•la•tion Pronunciation: (in"su-lā'shun, ins"yu-), [key] — n. material used for insulating. the act of insulating. the state of being insulated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: insulation (Thesaurus) insulate insulative Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language