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English definition of “either”

either

determiner, pronoun, conjunction     /ˈaɪ.ðər/ /ˈiː-/ US  /-ðɚ/
B1 used when referring to a choice between two possibilities : Either candidate would be ideal for the job . "Do you prefer pork or beef ?" "I don't like either." "Would you like the metal or plastic one?" "Either will do." You can get there by train or bus - either way/in either case it'll take an hour . We can either eat now or after the show - it's up to you. Either you leave now or I call the police !Either, or, neither, nor Grammar:EitherEither is a determiner, a pronoun, an adverb or a conjunction.Grammar:Either as a determinerGrammar:Either as a pronounWe can use either as a pronoun:Grammar:Either as an adverbWe can use either as an adverb after a negative verb:Grammar:Either as a conjunctionWe can use either with or as a conjunction to connect two clauses:Grammar:EitherorEither… or… connects two choices:
(Definition of either determinerpronounconjunction from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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