/ Dictionary / Index P preadaptation: Meaning and Definition of Find definitions for: pre•ad•ap•ta•tion Pronunciation: (prē"ad-up-tā'shun), [key] — n. Biol. a structure or property that developed in an ancestral stock and was useful in a descendant in a changed environment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. preadapt preadmission Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language