W: (n) subtraction [Related to: subtract] (an arithmetic operation in which the difference between two numbers is calculated) "the subtraction of three from four leaves one"; "four minus three equals one"
W: (n) subtraction [Related to: subtract] (the act of subtracting (removing a part from the whole)) "he complained about the subtraction of money from their paychecks"
W: (n) deduction [Related to: deduct] (the act of subtracting (removing a part from the whole)) "he complained about the subtraction of money from their paychecks"