Definitions from Wiktionary ( )

▸ adjective:  Being in one of two mutually exclusive states.
▸ adjective:  (logic) Concerning logic whose subject matter concerns binary states.
▸ adjective:  (arithmetic, computing) Concerning numbers and calculations using the binary number system.
▸ adjective:  Having two equally important parts; related to something with two parts.
▸ adjective:  (mathematics, programming, computer engineering) Of an operation, function, procedure, or logic gate, taking exactly two operands, arguments, parameters, or inputs; having domain of dimension 2.
▸ adjective:  (computing) Of data, consisting coded values (e.g. machine code) not interpretable as plain or ASCII text (e.g. source code).
▸ adjective:  (comparable) Focusing on two mutually exclusive conditions.
▸ noun:  A state in which only two values are possible, in which something must have one value or the other.
▸ noun:  (mathematics, computing, uncountable) The bijective base-2 numeral system, which uses only the digits 0 and 1.
▸ noun:  (computing) Synonym of binary file; a file consisting of data other than human-readable text.
▸ noun:  (astronomy) Synonym of binary asteroid.
▸ noun:  (astronomy) Synonym of binary planet.
▸ noun:  (astronomy) Synonym of binary star.

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