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Noun
1. subtractionMathematics
Wikipedia definition
2. SubtractionIn arithmetic, subtraction is one of the four basic binary operations; it is the inverse of addition, meaning that if we start with any number and add any number and then subtract the same number we added, we return to the number we started with. Subtraction is denoted by a minus sign in infix notation, in contrast to the use of the plus sign for addition. Since subtraction is not a commutative operator, the two operands are named.
Read “Subtraction” on English Wikipedia
Read “減法” on Japanese Wikipedia
Read “Subtraction” on DBpedia

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