Neither

1. прилагательное никакой (из двух представленных) Например: Neither opinion is true. — Ни та, ни другая точка зрения не является верной. 2. местоимение ни тот, ни другой; ни один, никто (из двух), ничто (из предложенных двух вариантов) Например: Neither of my sons ever met him. — Ни один из моих двух сыновей никогда не видел его. Neither of you can do that, — Никто из вас не может сделать этого. neither 3. союз вторая часть составного союза ни... ни ...; не ..., также не ...; не ... и не Например: neither hot nor cold — ни жарко, ни холодно neither more nor less than — ни больше ни меньше, как; не что иное, как He neither knows nor cares. — Ему всё равно. She neither called nor wrote. — Она не звонила и не писала. neither 4. наречие также не, тоже не Например: If he won't go, neither will she. — Если он не пойдёт, то и её не будет. If you do not take part in the conference, neither shall I. — Если вы не будете участвовать в конференции, то я тоже не буду.

Большой англо-русский словарь

Neither

I. conjunction Etymology: Middle English, alteration (influenced by either) of nauther, nother, from Old English nāhwæther, nōther, from nā, nō not + hwæther which of two, whether 1. not either Example: neither black nor white 2. also not Example: neither did I Usage: Although use with or is neither archaic nor wrong, neither is usually followed by nor. A few commentators think that neither must be limited in reference to two, but reference to more than two has been quite common since the 17th century Example: rigid enforcement of antique decorum will help neither language, literature, nor literati — James Sledd. II. pronoun not the one or the other of two or more Usage: Some commentators insist that neither must be used with a singular verb. It generally is, but especially when a prepositional phrase intervenes between it and the verb, a plural verb is quite common Example: neither of those ideal solutions are in sight — C. P. Snow. III. adjective not either Example: neither hand IV. adverb 1. chiefly dialect either Example: are not to be understood neither — Earl of Chesterfield 2. similarly not; also not Example: just as the serf was not permitted to leave the land, so neither was his offspring — G. G. Coulton

Merriam-Webster's Collegiate Dictionary