1 [uncertainty] In GIS data processing, the persistence of an error into new datasets calculated or created using datasets that originally contained errors. The study of error propagation is concerned with the effects of combined and accumulated errors throughout a series of data processing operations.
2 [computing] In computing, an outcome or occurrence that happens when a user interacts with an application. For example, in a case in which clicking a button triggers the closing of a form, the event is the closing of the form