Section 314(1) (inserted by section 12 of the Social Welfare Act, 1989) of the Principal Act is hereby amended by -
(a) the insertion after the definition of "allowance" of the following definitions:
"'antecedent order' means -
(a) an order under section 316(4),
(b) an order under section 316(5) (insofar as it isdeemed to be an order under section 17 of the Enforcement of Court Orders Act, 1926), or
(c) an order under section 316(5) (insofar as it is deemed to be an order under section 5 of the Enforcement of Court Orders Act, 1940);
'attachment of earnings order' means an order under section 316A;",
(b) the insertion after the definition of "competent authority" of the following definition:
"'earnings' means any sums payable to a person -
(a) by way of wages or salary (including any fees, bonus, commission, overtime pay or other emoluments payable in addition to wages or salary or payable under a contract of service),
(b) by way of pension or other like benefit in respect of