subtraction
sub.trac.tion \s*b-'trak-sh*n\ n 1: an act or instance of subtracting 2: the withdrawing or withholding from one of a right to which he is entitl ed 3: the operation of deducting one number from another
sub.trac.tion \s*b-'trak-sh*n\ n 1: an act or instance of subtracting 2: the withdrawing or withholding from one of a right to which he is entitl ed 3: the operation of deducting one number from another