Something that happens; a noteworthy happening. In the security context, this usually represents an occurrence such as a security incident, alarm, medical emergency, disaster, or related episode or experience
Minister of Aboriginal Affairs and Northern Development, Aboriginal Affairs and Northern Development Canada (AANDC) National Emergency Management Plan, Glossary, Minister of Public Works and Government Services, Ottawa, Canada 2011. http://www.aadnc-aandc.gc.ca/eng/1324572607784#a1, (ND/ Avalan/ Snowpack - Amer) {133}