binary
https://gyazo.com/09ef088fa17cca736bc405dae1ced698
source: By Cncplayer - Own work, CC BY-SA 3.0
adjective
1. relating to, composed of, or involving two things:
〖通例名詞の前で〗2つの, 2つから成る; 〘化〙 二元の.
e.g. testing the so-called binary, or dual-chemical, weapons.
2. relating to, using, or expressed in a system of numerical notation that has 2 rather than 10 as a base.
〘数〙 2進法の
noun (plural binaries)
1. the binary system:
〘数〙 2進法
e.g. binary notation
e.g. the device is counting in binary.
2. something having two parts.
a binary star.
〘天〙 連星(系)(binary star)
ORIGIN
late Middle English (in the sense ‘duality, a pair’): from late Latin binarius, from bini ‘two together’.