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Either (a. & pron.) One of two; the one or the other; -- properly used of two things, but sometimes of a larger number, for any one.
Either (a. & pron.) Each of two; the one and the other; both; -- formerly, also, each of any number.
Either (conj. Either) precedes two, or more, coordinate words or phrases, and is introductory to an alternative. It is correlative to or.