/ ˈbaɪnəri; NAmE / adjective
1.
( computing , mathematics ) using only 0 and 1 as a system of numbers :
the binary system
binary arithmetic
2.
( technical ) based on only two numbers; consisting of two parts :
binary code / numbers
—compare unary
► bin·ary noun [ U ]:
The computer performs calculations in binary and converts the results to decimal.
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WORD ORIGIN
late Middle English (in the sense duality, a pair ): from late Latin binarius , from bini two together.