Threat
1. A Threat is an indication or warning of probable man-made or natural situation that can cause disruption to an organization’s operations or services.
 Related Term: Natural Threat, Man-made Threat, Risk, Crisis Scenario 
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2. Potential cause of an unwanted incident, which may result in harm to individuals, a system or organization, the
environment or the community.
(Source: ISO 22399:2007 – Societal Security - Guideline for Incident Preparedness and Operational Continuity Management) - clause 3.48
3. A man-made or natural situation or condition that can cause disruption to an organization’s operations or services.
(Source: Singapore Standard 540 - SS 540:2008)
4. A measure of how likely a source of threat is to succeed in their activity.
(Source: Australia. A Practitioner's Guide to Business Continuity Management HB292 - 2006 )
5. An indication of an unwanted incident that could impinge on the system in some way.Threats may be deliberate(e.g.wilful,damage)or accidental(e.g.operator error).
(Source: OGC, Information Technology Infrastructure Library (ITIL) v3)
6. A potential cause of unwanted incident, which may result in harm to a system or organization.
[ISO5/IEC 13335-1:2004].
(Source: Malaysia BCM Standard MS1970:2007)
7. A combination of the risk, the consequence of that risk, and the likelihood that the negative event will take place.
(Source: ENISA - the European Network and Information Security Agency. BCM & Resilience Glossary)