Binary means made of two parts, or written using only ones and zeros. Binary code, a binary choice, binary star.
Computers use it because a switch is either on or off, and every number, letter and picture in a machine is stored that way. A binary choice is one with only two options, and the word is now often used to complain that a question was put too narrowly.
1adjectivebinaryMade of two parts, or written using only ones and zeros.
“The computer stores each letter you type as a binary number.”
binary is a quality.
Latin
bīnārius — consisting of two
Middle English
binarie
English, today
binary
From Middle English binarie, from Latin bīnārius (“consisting of two”).
Etymology from Wiktionary, CC BY-SA