Meaning of “either” in the English Dictionary

"either" in British English

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eitheradverb

uk /ˈaɪ.ðər/ /ˈiː.ðər/ us /ˈiː.ðɚ/ /ˈaɪ.ðɚ/

eitherdeterminer, pronoun, conjunction

uk /ˈaɪ.ðər/ /ˈiː.ðər/ us /ˈiː.ðɚ/ /ˈaɪ.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!

More examples

eitherdeterminer

uk /ˈaɪ.ðər/ /ˈiː.ðər/ us /ˈiː.ðɚ/ /ˈaɪ.ðɚ/

(Definition of “either” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"either" in American English

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eitheradverb [ not gradable ]

us /ˈi·ðər, ˈɑɪ-/

either adverb [ not gradable ] (ALSO)

used in negatives instead 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)