a first parent or earliest ancestor: Adam and Eve are the primogenitors of the human race.
a forefather or ancestor.
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How to use primogenitor in a sentence
It turns out that the act of creation is profoundly transformative, even for a formless, timeless, all-powerful primogenitor.3 Must Reads: ‘Kayak Morning,’ ‘Mr. g,’ and ‘Alex Gilvarry’ | Hillary Kelly, Mythili Rao, Jacob Silverman | February 8, 2012 | THE DAILY BEAST
British Dictionary definitions for primogenitor
a forefather; ancestor
an earliest parent or ancestor, as of a race
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012