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European Definitions

Availability is a measure of time during which a generating unit, transmission line, ancillary service or another facility is capable of providing service, whether or not it actually is in service. [1]

International Definitions


The property of being accessible and useable upon demand by an authorized entity. [2]

Disponibilité: Propriété d'être accessible et utilisable sur demande par une entité autorisée. [3]

Disponibilidad: Propiedad de ser accesible y utilizable a petición por una entidad autorizada. [4]

可用性: 能够根据授权实体的要求进行访问和使用的特性. [5]

National Definitions


The state of being accessible and usable in a timely and reliable manner.
Condition d’être accessible et utilisable de manière fiable et en temps opportun. [6]

Czech Republic

Property of availability and usability at the request of an authorized entity (Vlastnost přístupnosti a použitelnosti na žádost autorizované entity). [7]

United States

Ensuring timely and reliable access to and use of information. [8]

The property of being accessible and useable upon demand by an authorized entity. [8]

Standard Definition

ISO/IEC 27000:2014

Property of being accessible and usable upon demand by an authorized entity[9].

See also


  1. ENTSO-E Glossary of Terms
  2. ITU Security in Telecommunications and Information Technology: An overview of issues and the deployment of existing ITU-T Recommendations for secure telecommunications, ITU-T, Geneva (2012) - ITU-T H.235.
  3. Sécurité dans les télécommunications et les technologies de l’information: Aperçu des problèmes et présentation des Recommandations UIT-T existantes sur la sécurité dans les télécommunications, ITU-T, Geneva (2012) - ITU-T X.800.
  4. Seguridad de las telecomunicaciones y las tecnologías de la información: Exposición general de asuntos relacionados con la seguridad de las telecomunicaciones y la aplicación de las Recomendaciones vigentes del UIT-T, ITU-T, Geneva (2012) - ITU-T X.800.
  5. 关于电信安全的若干议题综述 及相关ITU-T建议书应用简介, ITU-T, Geneva (2012) - ITU-T H.235.
  6. Vocabulaire de la gestion des urgencies/Emergency Management Emergency Management Vocabulary 281 (2012)
  7. Cyber Security Explanatory Glossary (2013)
  8. 8.0 8.1 NISTIR 7298 rev 2: Glossary of Key Information Security Terms, May 2013
  9. ISO/IEC 27000:2014, Information technology -- Security techniques -- Information security management systems -- Overview and vocabulary