Occurrence n. : A coming or happening; as, the occurence of a railway collision.

Occurrence n. : Any incident or event; esp., one which happens without being designed or expected; as, an unusual occurrence, or the ordinary occurrences of life.

Example:


Taxonomy
occurrence, incident, happening, Synonyms, Dictionary, episode, everyday occurrence, Houghton Mifflin Company, medicine, cur, The action, occurrent, odd circumstance, property damage, one occurrence, Thesaurus, strange occurrence, Translations.

Defination from the web:
occurrence n. The action, fact, or instance of occurring. Something that takes place. occurrent occur ' rent adj ... Incident may apply to a minor occurrence: a small incident blown out of proportion. ...