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English definition of “either”

either

adverb [not gradable]  /ˈi·ðər, ˈɑɪ-/ us  

either adverb [not gradable] (ALSO)

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

either

adjective, pronoun, conjunction  /ˈi·ðər, ˈɑɪ-/ us  

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)
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