/ Dictionary / Index P primogenitor: Meaning and Definition of Find definitions for: pri•mo•gen•i•tor Pronunciation: (prī"mu-jen'i-tur), [key] — n. a first parent or earliest ancestor: Adam and Eve are the primogenitors of the human race. a forefather or ancestor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: primogenitor (Thesaurus) Primo de Rivera primogeniture Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language