What is another word for "conjugation"?

Roget's Thesaurus (1911) lists these synonyms for "conjugation": accidence, and, biformity, binary, binate, binomial, biparous, biplicity, both, brace, bracket, case, conduplicate, conjugate, correct, couple, declension, deuce, double, doublets, dual, dualism, dualistic, duality, duet, duplex, duplicity, dyad, dyadic, gemini, grammar, inflection, language, mate, norma, one, other, pair, parse, philology.