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either

determiner, pronoun, conjunction
 
 
/ˈaɪ.ðər/ /ˈiː-/ US  /-ðɚ/

Definition

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
(Definition of either determinerpronounconjunction from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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