either Definition in the Cambridge English Dictionary
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Definition of “either” - English Dictionary

Definition of "either" - American English Dictionary

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eitheradverb [not gradable]

 us   /ˈi·ðər, ˈɑɪ-/

either adverb [not gradable] (ALSO)

used in ​negativesinstead of also or too: The ​restaurant has good ​food, and it’s not ​expensive either.

eitheradjective, pronoun, conjunction

 us   /ˈi·ðər, ˈɑɪ-/

either adjective, pronoun, conjunction (CHOICE)

one or the other of two: Either ​person would be ​fine for the ​job. You can go by ​train or ​bus – either way it’ll take an ​hour. I ​left it either at ​home or in the ​car. You can also use either to ​mean both: Friends ​sat on either ​side of me on the ​plane.
(Definition of either from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "either" - British English Dictionary

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eitheradverb

uk   /ˈaɪ.ðər/ /ˈiː-/  us   /-ðɚ/
B1 used in ​negativesentencesinstead of "also" or "too": I don't ​eatmeat 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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eitherdeterminer, 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 ​preferpork 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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eitherdeterminer

uk   /ˈaɪ.ðər/ /ˈiː-/  us   /-ðɚ/
(Definition of either from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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SMART Thesaurus: Either, or, neither, nor

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