Definition of neither adverb from the Oxford Advanced American Dictionary

     

    neither

     adverb
    adverb
    NAmE//ˈniðər//
     
    , NAmE//ˈnaɪðər//
     
     
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  1. 1used to show that a negative statement is also true of someone or something else He didn't remember and neither did I. I hadn't been to New York before and neither had Jane. “I can't understand a word of it.” “Neither can I.” (informal) “I don't know.” “Me neither.”
  2. 2 neither… nor… used to show that a negative statement is true of two things I neither knew nor cared what had happened to him. Their house is neither big nor small. Neither the TV nor the DVD player actually works/work.
Grammarneither / eitherAfter neither and either, you use a singular verb:Neither candidate was selected for the job.Neither of and either of are followed by a plural noun or pronoun and a singular or plural verb. A singular verb should be used in formal writing. A plural verb is more informal:Neither of my parents speaks/speak a foreign language.When neither… nor… or either… or… is used with two singular nouns, the verb is singular. When one of the nouns is plural, the verb agrees with the noun closest to it:Either she or her teachers are going to speak to the principal.
See the Oxford Advanced Learner's Dictionary entry: neither