unary

adjective
una·ry | \ ˈyü-nə-rē \

Definition of unary 

: having, consisting of, or acting on a single element, item, or component : monadic

First Known Use of unary

1923, in the meaning defined above

History and Etymology for unary

Latin unus one + English -ary

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The first known use of unary was in 1923

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to deposit or conceal in a hiding place

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