/ Dictionary / Index P perturbative: Meaning and Definition of Find definitions for: per•tur•ba•tive Pronunciation: (pûr'tur-bā"tiv, pur-tûr'bu-tiv), [key] — adj. having a tendency to perturb; disturbing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. perturbation pertussis Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language