unary(adj)

consisting of or involving a single element or component

"in a unary operation in a mathematical system one element is used to yield a single result"

unary(Noun)

The unary numeral system; the bijective base-1 numeral system.

unary(Noun)

Unary coding, an entropy encoding for natural numbers.

unary(Adjective)

Consisting of or involving a single element or component.

unary(Adjective)

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.