Definitions
1.DeterminerAny one (of two)."You can have it in either colour."
2.DeterminerEach of two; both. .mw-parser-output .defdate{font-size:smaller}"There is a locomotive at either end of the train, one pulling and the other pushing.; There are roses on either side of the garden."
3.DeterminerAny one (of more than two).
4.PronounOne or the other of two people or things."He made me two offers, but I did not accept either."
5.PronounBoth, each of two or more.
6.AdverbAs well."I don't like him, and I don't like her either.; I know a cheap Spanish restaurant. It's not far from here, either."
7.ConjunctionIntroduces the first of two (or occasionally more) options or possibilities, the second (or last) of which is introduced by “or”."Either you eat your dinner or you go to your room.; You can have either potatoes or rice with that, but not both.; You'll be either early, late, or on time.; Either you'll finish your homework or you'll be grounded you home."