1. Characterized by or consisting of two parts or components; twofold. 2. Of or relating to a system of numeration having 2 as its base. 3.Chemistry Consisting of or containing only molecules consisting of two kinds of atoms. 4. Of or employing two comparatively nontoxic chemicals that combine to produce a deadly poison: binary weapons; a binary nerve gas.5.Music Having two sections or subjects.
NOUN:
Inflected forms: pl. bi·na·ries Something that is binary, especially a binary star.
ETYMOLOGY:
Middle English binarie, from Late Latin bnrius, from Latin bn, two by two. See dwo- in Appendix I.