/ Dictionary / Index I illegitimatize: Meaning and Definition of Find definitions for: il•le•git•i•ma•tize Pronunciation: (il"i-jit'u-mu-tīz"), [key] — -tized, -tiz•ing. to make illegitimate: The decree illegitimatized his heirs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. illegitimate illegitimize 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