
In mathematics, a binary operation on a set is a calculation that combines two elements of the set (called operands) to produce another element of the set (more formally, an operation whose arity is two, and whose two domains and one codomain are (subsets of) the same set). Examples include the familiar elementary arithmetic operations of addition...
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http://en.wikipedia.org/wiki/Binary_operation

An operation that involves two operands. For example, addition and subtraction are binary operations.
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http://www.daviddarling.info/encyclopedia/B/binary_operation.html

a mathematical operation in which two elements are combined to yield a single result:Cf. ternary operation, unary operation. Addition and multiplication are binary operations on the set of real numbers.
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https://www.infoplease.com/dictionary/binary-operation
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