1.DeterminerNot one of two; not either; not one or the other.
"Neither definition seems correct."
2.ConjunctionNot either (used with nor).
"Neither you nor I likes it."
3.PronounNot either one of two.
"I’ve tried on both shirts, but neither fits properly.; Her words of advice will help neither of us."
4.AdverbSimilarly not.
"Just as you would not correct it, neither would I.; Neither can she stop him, nor can he stop her.; Neither now, nor ever will he forsake his mother."