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Noun
1. monadic operation; unary operationComputing
Wikipedia definition
2. Unary operationIn mathematics, a unary operation is an operation with only one operand, i.e. a single input. Specifically, it is a function where A is a set. In this case f is called a unary operation on A. Common notations are prefix notation (e.g. +, −, not), postfix notation, functional notation (e.g. sin x or sin), and superscripts.
Read “Unary operation” on English Wikipedia
Read “単項演算” on Japanese Wikipedia
Read “Unary operation” on DBpedia

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