Repetition

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late Middle English: from Old French repeticion or Latin repetitio(n- ), from repetere (see repeat).

wiktionary

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Borrowed from Latin repetitionem (accusative singular of repetitio; cf. French répétition). Doublet of repetitio.

re- +‎  petition

etymonline

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repetition (n.)

early 15c., repeticioun, "act of saying over again," from Old French repetition and directly from Latin repetitionem (nominative repetitio) "a repeating," noun of action from past-participle stem of repetere "do or say again" (see repeat (v.)). Of actions or events recurring or done again, attested from 1590s; specifically in physical fitness from 1958. Related: Repetitions.