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Noun
1. binary operation; dyadic operationMathematics
Wikipedia definition
2. Binary operationIn mathematics, a binary operation is a calculation involving two operands (an operation whose arity is two). Examples include the familiar arithmetic operations of addition, subtraction, multiplication and division. Let A, B and C be three sets. Then a relation * from A X B --> C is a binary relation. This is a general binary relation. Usually, but not always, the case of binary relations defined on a single set is of interest.
Read “Binary operation” on English Wikipedia
Read “二項演算” on Japanese Wikipedia
Read “Binary operation” on DBpedia

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