unary [yoo-nuh-ree] Word Origin adjective Mathematics.

  1. pertaining to a function whose domain is a given set and whose range is contained in that set.

Origin of unary 1570–80; Latin ūn(us) one + -ary, on the model of binary British Dictionary definitions for unary unary adjective

  1. consisting of, or affecting, a single element or component; monadic

Word Origin for unary C16 (in the obsolete sense: a unit): from Latin unus one + -ary Word Origin and History for unary adj.

1923, from Latin unus “one” (see one) on model of binary, etc.

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