unary operation

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u·na·ry operation

A mathematical operation, such as the square root function and complex conjugation, that requires only one operand.

[Blend of uni- and binary.]
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Noun1.unary operation - an operation with exactly one operand
operation - (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction); "it can perform millions of operations per second"
unarna operacija