neither

adjective,

not one or the other (of two); not either neither boy went; neither of them was invited

Etymology: ME naither, altered (by assoc. with eyther, either) < nauther < OE na-hwæther, lit., not whether (see no, whether), not either of two

1. not either: the first element of the pair of correlatives neither … nor, indicating negation of both parts of the statement [I could neither laugh nor cry]: neither … nor is sometimes used to refer to more than two, although this use is objected to by some [the shop sells neither tobacco, beer, nor wine]
2. nor yet; and … not he does not smoke, neither does he drink

adverb

Informal, Dialectal any more than the other; also: used after negative expressions if she won't go, I won't neither