1. (noun)binary star, binary, double star a system of two stars that revolve around each other under their mutual gravitation
2. (noun)binary, binary program a pre-compiled, pre-linked program that is ready to run under a given operating system; a binary for one operating systemwill not run on a different operating system "the same source code can be compiled to produce different binaries for different operating systems"
3. (adj)binary of or pertaining to a numbersystemhave 2 as its base "a binary digit"
4. (adj)binary consisting of two (units or components or elements or terms)
"a binary star is a system in which two stars revolve around each other"; "a binary compound"; "the binary number system has two as its base"