Unary definition

Consisting of or involving a single element or component.
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(mathematics, programming, computer engineering) Of an operation, function, procedure, or logic gate, taking exactly one operand, argument, parameter, or input; having domain of dimension 1.

Negation is a unary operation.

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(mathematics) The unary numeral system; the bijective base-1 numeral system.
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(information theory) Unary coding, an entropy encoding for natural numbers.
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Origin of unary

  • Late Latin unarius (“consisting of a single thing"), from unus (“one").

    From Wiktionary