Synonyms and related words :
balance, ballast, coequality, coextension, consideration, correspondence, counterbalance, counterpoise, counterweight, equality, equation, equilibrium, equipollence, equiponderance, equity, equivalence, equivalency, equivalent, evenness, give-and-take, identity, justice, levelness, likeness, makeweight, offset, par, parallelism, parity, poise, proportion, quid pro quo, setoff, something of value, stasis, symmetry, tit for tat