What is another word for "pair"?

Roget's Thesaurus (1911) lists these synonyms for "pair": ablude, all, alteration, and, another, apart, apple, average, balance, biformity, binary, binate, binomial, biparous, biplicity, both, brace, bracket, change, characteristic, color, common, commonplace, compromise, conduplicate, conjugate, conjugation, contradistinction, contrast, couple, course, daedal, delicate, denominator, deuce, differ, difference, different, differentia, differently.