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unary

[yoo-nuh-ree]
adjective Mathematics.
  1. pertaining to a function whose domain is a given set and whose range is contained in that set.
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Origin of unary

1570–80; < Latin ūn(us) one + -ary, on the model of binary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for unary

unary

adjective
  1. consisting of, or affecting, a single element or component; monadic
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Word Origin for unary

C16 (in the obsolete sense: a unit): from Latin unus one + -ary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unary

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper