binary

 
Pronunciation: /ˈbʌɪnəri/

adjective

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

noun (plural binaries)

  • 1 [mass noun] the binary system of notation: the device is counting in binary
  • 2something having two parts.
  • a binary star.

Origin:

late Middle English (in the sense 'duality, a pair'): from late Latin binarius, from bini 'two together'

Spelling help

Remember that binary ends with -ary.