Definition of either determiner from the Oxford Advanced Learner's Dictionary



    determiner, pronoun
    BrE BrE//ˈaɪðə(r)//
    ; NAmE NAmE//ˈaɪðər//
    ; BrE BrE//ˈiːðə(r)//
    ; NAmE NAmE//ˈiːðər//
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  1. 1  one or the other of two; it does not matter which You can park on either side of the street. You can keep one of the photos. Either of them—whichever you like. There are two types of qualification—either is acceptable. Grammar Pointneither / either After neither and either you use a singular verb:Neither candidate was selected for the job. Neither of and either of are followed by a plural noun or pronoun and a singular or plural verb. A plural verb is more informal:Neither of my parents speaks/​speak a foreign language. When neither… nor… or either… or… are used with two singular nouns, the verb can be singular or plural. A plural verb is more informal.
  2. 2  each of two The offices on either side were empty. There's a door at either end of the corridor.
  3. Word OriginOld English ǣgther, contracted form of ǣg(e)hwæther, of Germanic origin; ultimately related to aye and whether.
See the Oxford Advanced American Dictionary entry: either