(22) of s. 2 defines wages as follows:- "(22) wages" means all remuneration paid or payable in cash to an employee if the terms of the contract of employment, express or implied, were fulfilled and includes any payment to an employee in respect of any period of authorised leave, lock-out, strike which is not illegal or lay-of f and other additional remuneration, if any, paid at intervals not exceeding two months but does not include (a) any contribution paid by the employer to any Pension fund or provident fund, or under this Act;