American English

Definition of either determiner from the Oxford Advanced American Dictionary

      

    either

     determiner,pronoun
    determiner, pronoun
    NAmE//ˈiðər//
     
    , NAmE//ˈaɪðər//
     
     
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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 application—either is acceptable. Grammarneither / eitherAfter 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 singular verb should be used in formal writing. A plural verb is more informal:Neither of my parents speaks/speak a foreign language.When neither… nor… or either… or… is used with two singular nouns, the verb is singular. When one of the nouns is plural, the verb agrees with the noun closest to it:Either she or her teachers are going to speak to the principal.
  2. 2 each of two The offices on either side were empty. There's a door at either end of the hallway.
See the Oxford Advanced Learner's Dictionary entry: either