/ Dictionary / Index P preinvasive: Meaning and Definition of Find definitions for: pre•in•va•sive Pronunciation: (prē"in-vā'siv), [key] — adj. Pathol. of or pertaining to a stage preceding invasion of the tissues; in situ. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. preinform pre-Islamic Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language