Meaning

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

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

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

originFrom Late Latin bīnārius (“consisting of two”), from Latin bīnī (“two-by-two, pair”). By surface analysis, bin- + -ary.

Etymology from Wiktionary, CC BY-SA 3.0