Etymology
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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).

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Definitions of injection

injection (n.)
the act of putting a liquid into the body by means of a syringe;
Synonyms: shot
injection (n.)
the forceful insertion of a substance under pressure;
injection (n.)
any solution that is injected (as into the skin);
Synonyms: injectant
From wordnet.princeton.edu