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primogenitor

[prahy-muh-jen-i-ter] /ˌpraɪ məˈdʒɛn ɪ tər/
noun
1.
a first parent or earliest ancestor:
Adam and Eve are the primogenitors of the human race.
2.
a forefather or ancestor.
Origin
1645-1655
1645-55; < Late Latin prīmōgenitor ancestor, equivalent to Latin prīmō at first + genitor genitor
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for primogenitor

primogenitor

/ˌpraɪməʊˈdʒɛnɪtə/
noun
1.
a forefather; ancestor
2.
an earliest parent or ancestor, as of a race
Word Origin
C17: alteration of progenitor after primogeniture
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for primogenitor
n.

"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.

Online Etymology Dictionary, © 2010 Douglas Harper
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