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Adverb: either  ee-dhu(r) or I-dhu(r)
  1. After a negative statement used as an intensive meaning something like 'likewise' or 'also'
    "he isn't stupid, but he isn't exactly a genius either"; "I don't know either"; "if you don't order dessert I won't either"
Conjunction: either  ee-dhu(r) or I-dhu(r)
  1. Used before two (or more) alternatives
    "you either passed or failed your test"

Encyclopedia: Either