Definition of either

  1. either Determiner Each of two.
  2. either Determiner One or the other of two.
  3. either Pronoun Both, each of two (people or things).
  4. either Pronoun One or other of two people or things.
  5. either Adverb as well
  6. either Conjunction Introduces the first of two options, the second of which is introduced by "or".
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