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Event can refer to:

  • A phenomenon, any observable occurrence, or an extraordinary occurrence

A type of gathering:

In science, technology, and mathematics:

  • Event (computing), a software message indicating that something has happened, such as a keystroke or mouse click
  • Event (probability theory), a set of outcomes to which a probability is assigned
  • Event (UML), in Unified Modeling Language, a notable occurrence at a particular point in time
  • Event chain methodology, in project management
  • Event horizon, a boundary in spacetime, typically surrounding a black hole, beyond which events cannot effect an exterior observer
  • Extinction event, a sharp decrease in the number of species in a short period of time
  • Celestial event, an astronomical phenomenon of interest
  • Event, in a particle collider, a collision producing detectable results

In philosophy:

  • Event (philosophy), an object in time, or an instantiation of a property in an object
  • Mental event, something that happens in the mind, such as a thought

See also

  • Eventing, an equestrian event comprising dressage, cross-country and show-jumping
  • Event management
  • Event planning
  • News, new information or information on current events
  • Portal:Current events (Wikipedia portal)

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Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

See also évent



Wikipedia has an article on:



From Latin ēventus (an event, occurrence), from ēveniō (happen, fall out, come out), from ē (out of, from), short form of ex, + veniō (come); see venture, and cf. advent, convent, invent, etc., convene, evene, etc.





event (plural events)

  1. An occurrence of social or personal importance.
  2. (physics) A point in spacetime having three spatial coordinates and one temporal coordinate
  3. (computing) A possible action that the user can perform and is monitored by an application or the operating system (event listener). When an event occurs an event handler is called which performs a specific task.
  4. (probability theory) A set of some of the possible outcomes; a subset of the sample space.

Derived terms


The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Help:How to check translations.

External links

  • event in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
  • event in The Century Dictionary, The Century Co., New York, 1911

Simple English

Simple English Wiktionary has the word meaning for:

An event is something which happens or takes place. An event is brief, possibly extremely brief. Contrast with a process, which takes time.

  • Alternate meaning: an important activity, an item in a program, or the program as a whole.

Different events are important for different people. People think about their lives like they are made up of different pieces, and they separate the pieces by events they think are important.


  • A special occasion, such as a wedding or other party, is a social event.



  • In information processing, an event is a change in the properties received by an observer after being transmitted from an object.
  • In computer science, an event is a software message that indicates something has happened. See event-driven programming. A number of protocols, such as MIDI, are also event-based.


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