Disruption
1. A Disruption is an interruption of normal business operations or processes which can range from short term to longer term unavailability.
 Related Terms: Crisis, Disaster, Event, Incident, Emergency, Operational Disruptions 
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2. Event, whether anticipated (e.g. a labour strike or hurricane) or unanticipated (e.g. a blackout or earthquake), which causes an unplanned, negative deviation from the expected delivery of products or services according to the organization’s objectives.
(Source: AE/HSC/NCEMA 7000:2012)
3. Incident, whether anticipated (e.g. hurricane) or unanticipated (e.g. a blackout or earthquake) which disrupts the normal course of operations at an organization location
Notes: A disruption can be caused by either positive or negative factors that will disrupt normal operations.
(Source: ISO 22399:2007 – Societal Security - Guideline for Incident Preparedness and Operational Continuity Management) - clause 3.5
4. Event, whether anticipated (e.g. a labour strike or hurricane) or unanticipated (e.g. a blackout or earthquake), which causes an unplanned, negative deviation from the expected delivery of products or services according to the organization’s objectives.
(Source: British Standard BS25999-1:2006 Code of Practice for Business Continuity Management)
5. Interruption of normal business operations or processes which can range from short term to longer term unavailability. For example, a fire which destroys the main plant facility disrupts the production operations until an alternate facility is established.
(Source: Singapore Standard 540 - SS 540:2008)
6. An event which interrupts the ability of an organisation to deliver its outputs.
(Source: ENISA - the European Network and Information Security Agency. BCM & Resilience Glossary)