Section 2(1)(l) in Indian Stamp (Collection of Stamp-Duty through Stock Exchanges, Clearing Corporations and Depositories) Rules, 2019
(l)"settlement day" means the day on which, -(i)a transaction is settled by a stock exchange or an authorised clearing corporation, by completing the delivery of funds to the seller and delivery of underlying securities corresponding to those funds to the buyer; or(ii)it is reported to a stock exchange or a clearing corporation specifying that the transaction in securities has been carried out provided the security is not held in dematerialised form with any of the depositories; or(iii)an issue or transfer has been effected in a depository in respect of securities held in dematerialised form which may have to be later reported to the stock exchange or a clearing corporation.