/ Dictionary / Index I imperturbation: Meaning and Definition of Find definitions for: im•per•tur•ba•tion Pronunciation: (im"pur-tur-bā'shun), [key] — n. freedom from perturbation; tranquillity; calmness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. imperturbable impervious Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language