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

either

determiner, pronoun
 
/ˈaɪðə(r)/,
 
/ˈiːðə(r)/
 
/ˈiːðər/,
 
/ˈaɪðər/
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  1. one or the other of two; it does not matter which
    • You can park on either side of the street.
    • Either of these approaches will help you reduce costs.
    • There are two types of qualification—either is acceptable.
    Grammar Point neither / eitherneither / 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. 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 either in the Oxford Advanced American DictionarySee either in the Oxford Learner's Dictionary of Academic English
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