either definition, meaning - what is either in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “either”

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either

adverb uk   /ˈaɪ.ðər/ /ˈiː-/  us   /-ðɚ/
B1 used in negative sentences instead of "also" or "too": I don't eat meat and my husband doesn't either. "I've never been to the States." "I haven't either." They do really good food at that restaurant and it's not very expensive either.
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either

determiner, pronoun, conjunction uk   /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!
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either

(Definition of either from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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