used before the first of two (or occasionally more) given alternatives (the other being introduced by ‘or’)

either I accompany you to your room or I wait here

available in either black or white

used to indicate a similarity or link with a statement just made

You don't like him, do you? I don't either

it won't do any harm, but won't really help either

used before the first of two (or occasionally more) given alternatives (the other being introduced by ‘or’)

either I accompany you to your room or I wait here

available in either black or white

used to indicate a similarity or link with a statement just made

You don't like him, do you? I don't either

it won't do any harm, but won't really help either

one or the other of two people or things

there were no children of either marriage

their mortgage will be repaid if either of them dies

one or the other of two people or things

there were no children of either marriage

their mortgage will be repaid if either of them dies