adjective Mathematics.

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
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British Dictionary definitions for unary



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
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

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

Online Etymology Dictionary, © 2010 Douglas Harper