1. An occurrence or happening of significance to a task or program, such as the completion of an asynchronous input/output operation. A task may wait for an eveNT or any of a set of eveNTs or it may (request to) receive asynchronous notification (a signal or iNTerrupt) that the eveNT has occurred. See also eveNT-driven. 2. A transaction or other activity that affects the records in a file. (2000-02-09)