Acting on a single number, mathematically

• Like certain math operations
• Having but one component
• Consisting of a single element or component
• Having only one component
• Consisting of a single element
• Of one kind, in chemistry
• Having a single element

Wiktionary Word definitions in Wiktionary
a. 1 Consisting of or involving a single element or component. 2 (context mathematics programming computer engineering English) Of an operation, function, procedure(,) or logic gate, taking exactly one operand, argument, parameter(,) or input; having domain ...

Wikipedia Word definitions in Wikipedia
Unary may refer to: Unary numeral system , the simplest numeral system to represent natural numbers Unary function , a function that takes one argument; in computer science, a unary operator is a subset of unary function Unary operation , a kind of mathematical ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1923, from Latin unus "one" (see one ) on model of binary , etc.