In most cases, neither means "not either." When used as an adjective either means "one or the other of two people or things," and neither means "not one or the other of two people or things." In other words, neither means "not either." The following example sentences show this use.

How do you use either or neither?

Either means 'both', 'one' and neither means 'not either', 'none'. Either is used in negative constructions, while neither is used in affirmative constructions.

What is difference between neither and either?

Alone: either means “one of the two”; neither means “none of the two.” Use a singular verb.