Origin: Latin suffix -tion
Interjection has 3 different meanings across 1 category:
an abrupt emphatic exclamation expressing emotion
the action of interjecting or interposing an action or remark that interrupts
An exclamation or filled pause; a word or phrase with no particular grammatical relation to a sentence, often an expression of emotion.
The word comes from the Latin interiectiō, meaning "a throwing or placing between." It entered English via Middle English and Old French, replacing an earlier Germanic term with a similar literal meaning.