Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Late Latin
Origin: binarius, from Latin bini 'two by two'

binary

adjective
     
bi‧na‧ry
1TD

the binary system

HMTD a system of counting, used in computers, in which only the numbers 0 and 1 are used
2 consisting of two parts [= double]:
a binary star system

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