- a first parent or earliest ancestor: Adam and Eve are the primogenitors of the human race.
- a forefather or ancestor.
Origin of primogenitor
- a forefather; ancestor
- an earliest parent or ancestor, as of a race
Word Origin and History for primogenitor
"an ancestor," late 15c., from Medieval Latin primogenitor, from Latin primo (adv.) "first in order of time; at first," from primus "first" (see prime (adj.)) + genitor "father," from genitus, past participle of gignere "to beget" (see genus). Related: Primogenital; primogenitary. The fem. form is primogenitrix (1875). The rights of a second son are secundogeniture.