either UK /ˈaɪ.ðə/US /ˈaɪ.ðɚ/conjunction 1determiner 3pronoun 2adverb 1 conjunction1 •showing the first possibility in a choice between two or sometimes more, with "or" before the lastEither you eat your dinner or you go to your room.You can have either potatoes or rice with that, but not both. determiner3 •Any one (of two).You can have it in either colour. •(nonstandard) Any one (of more than two).They entreat, they pray, they beg, they supplicate (will either of these do, Miss Clary?) that you will make no scruple to go to your uncle Antony's […]. — 1748 •Each of two; both.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. pronoun2 •One or the other of two people or things.He made me two offers, but I did not accept either. •(no longer used) Both, each of two or more.Scarce a palm of ground could be gotten by either of the three. — 1627 adverb1 •As 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.