adj., pron., adv., & conj.
--adj. & pron.
1. one or the other of two (either of you can go; you may have either book).
2 each of two (houses on either side of the road; either will do).
--adv. & conj.
1. as one possibility (is either black or white).
2 as one choice or alternative; which way you will (either come in or go out).
3 (with neg. or interrog.) a any more than the other (I didn't like it either; if you do not go, I shall not either). b moreover (there is no time to lose, either).
Phrases and idioms:
either-or n. an unavoidable choice between alternatives.
--adj. involving such a choice. either way in either case or event.
Etymology: OE {aelig}gther f. Gmc