Definition of "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

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

adjective: consisting of two (units or components or elements or terms)

"A binary star is a system in which two stars revolve around each other."

adjective: of or pertaining to a number system have 2 as its base

"A binary digit."