binary

of or pertaining to a number system have 2 as its base; "a binary digit"

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"

a system of two stars that revolve around each other under their mutual gravitation

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; "the same source code can be compiled to produce different binaries for different operating systems"