Neither a. : Not either; not the one or the other.

Neither conj. : not either; generally used to introduce the first of two or more coordinate clauses of which those that follow begin with nor.

Example:
What happens if Neither presidential candidate gets 270 votes?

Taxonomy
Merriam-Webster Online Dictionary, Dictionary, webster, language, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, conjunction, Middle English, Old English, glossary, english, ESL, Search, Etymology, alteration, nother, 12th century.

Defination from the web:
neither from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 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 ...