Meaning Of 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.

a. & pron.

Each of two; the one and the other; both; -- formerly, also, each of any number.

conj. Either

precedes two, or more, coordinate words or phrases, and is introductory to an alternative. It is correlative to or.