definition of
subtraction

[1] #1 subtraction n. [minus] 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". wn

[2] #2 subtraction n. [deduction] the act of subtracting (removing a part from the whole); "he complained about the subtraction of money from their paychecks". wn