Section 2(1)(a) in The Payment And Settlement Systems Act, 2007
(a)"bank" means,--(i)a bank included in the Second Schedule to the Reserve Bank of India Act, 1934 (2 of 1934);(ii)a post office savings bank;(iii)a banking company as defined in clause (c) of section 5 of the Banking Regulation Act, 1949 (10 of 1949);(iv)a co-operative bank as defined in clause (cci) of section 5, as inserted by section 56, of the Banking Regulation Act, 1949 (10 of 1949); and(v)such other bank as the Reserve Bank may, by notification, specify for the purposes of this Act;