One of the mysteries of the English language finally explained.
That is the origin or source of something; that gives rise to, or causes the existence of, something.
Late 16th century (in an earlier sense). From Middle French, French originaire, adjective and noun and its etymon post-classical Latin originarius that originates from a particular place, native, existing from the beginning, innate, also a native from classical Latin orīgin-, orīgō + -ārius.
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