ETYM Latin subtractio a drawing back. Related to Subtract, Substraction.
1. An arithmetic operation in which the difference between two numbers is calculated; SYN. minus.
2. The act of subtracting (removing a part from the whole); SYN. deduction.
Taking one number or quantity away from another, or finding the difference between two quantities; it is one of the four basic operations of arithmetic. Subtraction is neither commutative.
A - b ą b - a.
A - (b - c) ą (a - b) - c).
8 - 5 ą 5 - 8.
7 - (4 - 3) ą (7 - 4) - 3.