[nei.ther] conj [ME, alter. (influenced by either) of nauther, nother, fr. OE nahwaether, nother, fr. na, no not + hwaether which of two, whether] (12c) 1: not either "~ black nor white"
2: also not "~ did I" usage Although use with or is neither archaic nor wrong, neither is usu. 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 "rigid enforcement of antique decorum will help neither language, literature, nor literati --James Sledd".
[2]neither pron (13c): 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 esp. when a prepositional phrase intervenes between it and the verb, a plural verb is quite common "neither of those ideal solutions are in sight --C. P. Snow". [3]neither adj (14c): not either "~ hand" [4]neither adv (1551) 1 chiefly dial: either "are not to be understood ~ --Earl of Chesterfield"
2: similarly not: also not "just as the serf was not permitted to leave the land, so ~ was his offspring --G. G. Coulton"