What does binary mean?
"Binary" describes anything founded on a pair of alternatives: two states, two choices, or two components. Its most familiar modern sense is technical — the binary number system, built entirely on the digits 0 and 1, underpins all modern digital computing, so that text, images, and sound are ultimately encoded as sequences of these two values. More broadly, the adjective applies to any twofold division, as in a binary choice, a binary classification, or the binary opposition of good versus evil in literary analysis. In astronomy, a "binary" is a pair of stars orbiting a shared centre of mass, and as a noun the word can also mean a binary file or program in computing. The term derives from Latin bini, meaning "two at a time." While neutral in scientific contexts, "binary" in ordinary conversation often carries a critical edge when applied to social categories, implying an oversimplified either-or view of something more complex.
Composed of or relating to two things or parts; based on exactly two states, options, or digits.
"The questionnaire offered a strictly binary set of answers."
Often used critically of oversimplified either/or framings.
The binary number system using only the digits 0 and 1, or a binary file/program in computing; in astronomy, a system of two orbiting bodies.
"She wrote a small utility to inspect the raw bytes of the binary."
Plural "binaries"; in astronomy, "binary" is short for "binary star system."
Used for multiple binary systems (astronomy), binary files/programs (computing), or binary oppositions in academic writing.
"The catalogue lists several well-known visual binaries in the northern sky."
Everything you have ever seen on a screen — photos, music, this sentence — is ultimately just strings of 0s and 1s.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of binary
"Binary" comes from the Late Latin binarius, derived from Latin bini, meaning "two at a time" or "in pairs." The word entered English in the late sixteenth century, originally in general senses relating to pairs or doubleness. It shares its root with words such as "binomial," "combine," and "combination," all tracing back through Latin to the same notion of twoness. Its prominence expanded dramatically in the twentieth century with the rise of binary arithmetic in computer science.
Related word forms
How binary is actually used
In everyday speech, calling something 'binary' often implies an oversimplified either/or framing, sometimes critically ('life isn't binary'). In technical fields such as computing and astronomy, it carries precise, neutral meanings.
Easily confused with binary
A bindery is a workshop where books are bound, whereas binary relates to something composed of two parts or the two-digit number system.