(1) Information, labeled as a managed object, that relates to an event that has occurred within the managed object.
(2) An unscheduled, spontaneously generated message, issued by an agent when a significant or critical (data) condition occurs.
(3) An occurrence within a process that can trigger an action. Notifications can be used to model conditions of interest to be transmitted from a sender to a (usually unknown) set of interested parties (the receivers).
(4) A message that contains the event descriptions that are sent to managed resources, Web services and other resources.