What is the meaning of Either?

Any one (of two).

Each of two; both.

Any one (of more than two).

One or the other of two people or things.

Both, each of two or more.

As well.

Introduces the first of two (or occasionally more) options or possibilities, the second (or last) of which is introduced by “or”.

Both of two.

Each of two.

Either of two.

Both of two members of a group.

Each of two members of a group.

Either of two members of a group.

Both, all, or any of a set.

Each of a group.

Source: wiktionary.org

See also