Definition of neither determiner from the Oxford Advanced American Dictionary



determiner, pronoun
, NAmE//ˈnaɪðər//
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 not one nor the other of two things or people Neither answer is correct. Neither of them has/have a car. They produced two reports,neither of which contained any useful suggestions. “Which do you like?” “Neither. I think they're both ugly.”
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