Either

Part of speech: adjective (a.)

1. One of two; the one or the other; -- properly used of two things, but sometimes of a larger number, for any one. Lepidus flatters both, Of both is flattered; but he neither loves, Nor either cares for him. Shak. Scarce a palm of ground could be gotten by either of the three. Bacon. There have been three talkers in Great British, either of whom would illustrate what I say about dogmatists. Holmes.

2. Each of two; the one and the other; both; -- formerly, also, each of any number. His flowing hair In curls on either cheek played. Milton. On either side . . . was there the tree of life. Rev. xxii. 2. The extreme right and left of either army never engaged. Jowett (Thucyd).

Part of speech: conjunction (conj.)

precedes two, or more, coördinate words or phrases, and is introductory to an alternative. It is correlative to or. Either he is talking, or he is pursuing, or he is in a journey, or peradventure he sleepeth. 1 Kings xviii. 27. Few writers hesitate to use either in what is called a triple alternative; such as, We must either stay where we are, proceed, or recede. Latham.