Synonyms and related words :
biform, bifurcated, bilateral, bipartisan, bipartite, both, brace, couple, couplet, dichotomous, distich, double, double harness, doublet, duad, duadic, dual, dualistic, duet, duo, duplex, duplicated, dyad, dyadic, identical, match, matched, mates, pair, set of two, span, team, the two, twain, twin, twinned, two-sided, twosome, yoke