Etymology
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binary (adj.)

"dual, twofold, double," mid-15c., from Late Latin binarius "consisting of two," from bini "twofold, two apiece, two-by-two" (used especially of matched things), from bis "double" (from PIE root *dwo- "two"). Binary code in computer terminology was in use by 1952, though the idea itself is ancient. Binary star in astronomy is from 1802.

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Definitions of binary
1
binary (n.)
a system of two stars that revolve around each other under their mutual gravitation;
Synonyms: binary star / double star
binary (n.)
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;
Synonyms: binary program
2
binary (adj.)
of or pertaining to a number system have 2 as its base;
a binary digit
binary (adj.)
consisting of two (units or components or elements or terms);
a binary compound
the binary number system has two as its base
a binary star is a system in which two stars revolve around each other
From wordnet.princeton.edu