1923, from Latin unus "one" (from PIE root *oi-no- "one, unique") on model of binary, etc.
in a unary operation in a mathematical system one element is used to yield a single result
unappreciative
unapprehended
unapproachable
unapproved
unarmed
unary
unashamed
unasked
unaspiring
unassailable
unassimilated
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