The one or the other: Which movie do you want to see? Either will be fine. Used before the first of two or more coordinates or clauses linked by or: Either we go now or we remain here forever. Any one of two; one or the other: Wear either coat. One and the other; each: rings on either hand. Likewise; also. Used as an intensive following negative statements: If you don't order a dessert, I won't either.