ei·ther /ˈiðɚ/
 (a.)任一,兩方的任一,隨便任一個(conj.)或,也
 either
 任一
 Ei·ther, conj. Either 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.
 Note: ☞ Either was formerly sometimes used without any correlation, and where we should now use or.
    Can the fig tree, my brethren, bear olive berries? either a vine, figs?   --James iii. 12.
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 Ei·ther a. & pron.
 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).
 either
      adv : after a negative statement used as an intensive meaning
            something like `likewise' or `also'; "he isn't stupid,
            but he isn't exactly a genius either"; "I don't know
            either"; "if you don't order dessert I won't either"