c. 1400, requiten, "make return for, repay" (for good or ill), from Old French requiter or formed in English from re- "back" + Middle English quite "clear, pay up," an early variant of quit (v.) preserved in this word; in early use requite was often requit. Related: Requited; requiting.
suffix forming nouns of action from verbs, mostly from Latin and French, meaning "act of ______ing" (such as survival, referral), Middle English -aille, from French feminine singular -aille, from Latin -alia, neuter plural of adjective suffix -alis, also used in English as a noun suffix. Nativized in English and used with Germanic verbs (as in bestowal, betrothal).
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Harper, D. (n.d.). Etymology of requital. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/requital