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



    BrE BrE//ˈaɪðə(r)//
    ; NAmE NAmE//ˈaɪðər//
    ; BrE BrE//ˈiːðə(r)//
    ; NAmE NAmE//ˈiːðər//
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  1. 1  used after negative phrases to state that a feeling or situation is similar to one already mentioned Pete can't go and I can't either. (North American English, informal) ‘I don't like it.’ ‘Me either.’ (= Neither do I).
  2. 2  used to add extra information to a statement I know a good Italian restaurant. It's not far from here, either.
  3. 3  either… or… used to show a choice of two things Well, I think she's either Czech or Slovak. I'm going to buy either a camera or a DVD player with the money. Either he could not come or he did not want to.
  4. compare or
    Word OriginOld English ǣgther, contracted form of ǣg(e)hwæther, of Germanic origin; ultimately related to aye and whether. 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.
See the Oxford Advanced American Dictionary entry: either