Etymology
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interjection (n.)

early 15c., interjeccioun, "an interjected or exclamatory word," from Old French interjeccion (13c.) and directly from Latin interiectionem (nominative interiectio) "a throwing or placing between," also in grammar and rhetoric, noun of action from past-participle stem of intericere "to throw between, set between," from inter "between" (see inter-) + -icere, combining form of iacere "to throw" (from PIE root *ye- "to throw, impel"). Related: Interjectional.

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Definitions of interjection

interjection (n.)
an abrupt emphatic exclamation expressing emotion;
Synonyms: ejaculation
interjection (n.)
the action of interjecting or interposing an action or remark that interrupts;
From wordnet.princeton.edu