Definition of Interject

Babylon English Dictionary
place between other things, throw into the center of, interpolate; insert a remark or comment in the middle of a conversation
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Interject Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(v. t.)
To throw in between; to insert; to interpose.
  
(v. i.)
To throw one's self between or among; to come between; to interpose.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

interject
interjection \in`ter*jec"tion\ (?), n. [l. interjectio: cf. f. interjection. see interject.]
1. the act of interjecting or throwing between; also, that which is interjected. the interjection of laughing.
2. (gram.) a word or form of speech thrown in to express emotion or feeling, as o! alas! ha ha! begone! etc. compare exclamation. an interjection implies a meaning which it would require a whole grammatical sentence to expound, and it may be regarded as the rudiment of such a sentence. but it is a confusion of thought to rank it among the parts of speech. how now! interjections? why, then, some be of laughing, as, ah, ha, he!

JM Welsh <=> English Dictionary
Taflodi = v. to interject, to cast
WordNet 2.0

Verb
1. to insert between other elements; "She interjected clever remarks"
(synonym) come in, interpose, put in, throw in, inject
(hypernym) interrupt, disrupt, break up, cut off
(derivation) ejaculation, interjection