det
Any one (of two).
You can have it in either colour.
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.
Any one (of more than two).
I hope you will be ready to own publicly, whenever you shall be called to it, that by your great and frequent urgency you prevailed on me to publish a very loose and uncorrect account of my travels, with directions to hire some young gentleman of either university to put them in order, and correct the style, as my cousin Dampier did, by my advice, in his book called “A Voyage round the world.”
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 […].
pron
One or the other of two people or things.
He made me two offers, but I did not accept either.
Hodgson may now have to bring in James Milner on the left and, on that basis, a certain amount of gloss was taken off a night on which Welbeck scored twice but barely celebrated either before leaving the pitch angrily complaining to the Slovakian referee.
Both, each of two or more.
Scarce a palm of ground could be gotten by either of the three.
And either vowd with all their power and wit, / To let not others honour be defaste […]
adv
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.