Definition of either adverb from the Oxford Advanced American Dictionary

     

    either

     adverb
    adverb
    NAmE//ˈiðər//
     
    , NAmE//ˈaɪðər//
     
     
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  1. 1 used after negative phrases to state that a feeling or situation is similar to one already mentioned Pete can't go and I can't either. (informal) “I don't like it.” “Me either.” (= Neither do I).
  2. 2used to add extra information to a statement I know a good Italian restaurant. It's not far from here, either.
  3. 3either… or… used to show a choice of two things Well, I think she's either Czech or Slovak. I'm going to buy either a camera or a DVD player with the money. Either he could not come, or he did not want to. compare or, neither
See the Oxford Advanced Learner's Dictionary entry: either