binary /ˈbʌɪnəri/


I. adjective

1. relating to, composed of, or involving two things.
2. relating to, using, or denoting a system of numerical notation that has 2 rather than 10 as a base.
II. noun

1. [ mass noun] the binary system of notation.

the device is counting in binary.
2. something having two parts.
3. a binary star.
– origin late Middle English (in the sense ‘duality, a pair’): from late Latin binarius, from bini ‘two together’.

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