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either

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adverb, determiner, pronoun American English pronunciation: either /ˈiðər/
Either can be used in the following ways:
in the expression either...or: Students could choose either French or Spanish. ♦ You can either come by bus or take a taxi.
as a determiner (followed by a singular countable noun): a long room with a door at either end
as a pronoun: Olive oil and corn oil are both fine, so you could use either. (followed by "of"): Does either of you speak Chinese?
as an adverb (in negative sentences): Jerry wasn't there either.
When either is the subject of a sentence, it is usually used with a singular verb: Is either of them at home? But in spoken English a plural verb is sometimes used: Are either of them at home?
 

Related dictionary definitions

  1. 1
    one or the other of two people or things, especially when it does not matter which

    Check or credit card – you can use either.

    Applications are welcomed from people of either sex and any age.

    either of:

    It was a long time before either of them spoke.

  2. 2
    used in negative statements referring to both of two people or things

    Jackie could play the piano and sing, whereas I couldn't do either.

    Most of the troublemakers were not fans of either team.

    either of:

    I didn't like either of the candidates.

    1. a.
      used for adding that a negative statement is also true of another person or thing

      It's a problem I can't solve, and I don't think anyone else can either.

      We tried another method, but that didn't work either.

    See also  also

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