'Either' definitions:

Definition of 'either'

From: WordNet
adverb
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"

Definition of 'Either'

From: GCIDE
  • Either \Ei"ther\, conj. Either precedes two, or more, co["o]rdinate words or phrases, and is introductory to an alternative. It is correlative to or. [1913 Webster]
  • Either he is talking, or he is pursuing, or he is in a journey, or peradventure he sleepeth. --1 Kings xviii. 27. [1913 Webster]
  • 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. [1913 Webster]
  • Note: Either was formerly sometimes used without any correlation, and where we should now use or. [1913 Webster]
  • Can the fig tree, my brethren, bear olive berries? either a vine, figs? --James iii. 12. [1913 Webster]

Definition of 'Either'

From: GCIDE
  • Either \Ei"ther\ ([=e]"[th][~e]r or [imac]"[th][~e]r; 277), a. & pron. [OE. either, aither, AS. [=ae]g[eth]er, [=ae]ghw[ae][eth]er (akin to OHG. [=e]ogiwedar, MHG. iegeweder); [=a] + ge + hw[ae][eth]er whether. See Each, and Whether, and cf. Or, conj.]
  • 1. One of two; the one or the other; -- properly used of two things, but sometimes of a larger number, for any one. [1913 Webster]
  • Lepidus flatters both, Of both is flattered; but he neither loves, Nor either cares for him. --Shak. [1913 Webster]
  • Scarce a palm of ground could be gotten by either of the three. --Bacon. [1913 Webster]
  • There have been three talkers in Great British, either of whom would illustrate what I say about dogmatists. --Holmes. [1913 Webster]
  • 2. Each of two; the one and the other; both; -- formerly, also, each of any number. [1913 Webster]
  • His flowing hair In curls on either cheek played. --Milton. [1913 Webster]
  • On either side . . . was there the tree of life. --Rev. xxii. 2. [1913 Webster]
  • The extreme right and left of either army never engaged. --Jowett (Thucyd). [1913 Webster]

Synonyms of 'either'

From: Moby Thesaurus