(in coining neologisms) A vowel inserted interconsonantally between morphemes of Latinate origin in order to ease pronunciation (an anaptyxis, a linking vowel).

(pharmacology) a monoclonal antibody derived from a non-human primate source

plural of I (letter of the alphabet)

plural of the letter i

It's (it is).

(colloquial, poetic) in / (colloquial) it

(US, roadway) Interstate. / (grammar) Abbreviation of instrumental case. / (computing) Abbreviation of instruction.

The speaker or writer, referred to as the grammatical subject, of a sentence. / (nonstandard) The speaker or writer, referred to as the grammatical object, of a sentence.

(metaphysics) The ego.

Obsolete spelling of aye.