Injection

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late Middle English: from Latin injectio(n- ), from the verb inicere (see inject).

wiktionary

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Borrowed from Middle French injection, from Latin iniectio. The mathematical sense is from French injection, introduced by Nicolas Bourbaki in their treatise Éléments de mathématique.

etymonline

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injection (n.)

"a forcing of a fluid into a body" (with a syringe, etc.), early 15c., from Old French iniection (14c.) or directly from Latin iniectionem (nominative iniectio) "a throwing in," noun of action from past participle stem of inicere "to throw in or on" (see inject).