binary (Adjective) — Of or pertaining to a number system which has 2 as its base. ex. "a binary digit"
binary (Adjective) — Consisting of two (units, components, elements or terms). ex. "a binary star is a system in which two stars revolve around each other" ex. "a binary compound" ex. "the binary number system has two as its base"
binary (Noun) — A system of two stars that revolve around each other under their mutual gravitation.
binary (Noun) — A pre-compiled, pre-linked program that is ready to run under a given operating system; a binary for one operating system will not run on a different operating system. ex. "the same source code can be compiled to produce different binaries for different operating systems"