Promotion

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late Middle English (in promotion (sense 3)): via Old French from Latin promotio(n- ), from promovere ‘move forward’ (see promote).

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From Old French promocion, from Latin promotio.

etymonline

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promotion (n.)

c. 1400, promocioun, "advancement in rank, honor, or position," from Old French promocion "election, promotion" (14c., Modern French promotion) and directly from Latin promotionem (nominative promotio) "advancement, a moving forward," noun of action from past-participle stem of promovere "move forward, advance" (see promote).

From early 15c. as "advancement of a cause; assistance, help, support, encouragement." The meaning "advertising, publicity" first recorded 1925.