(1) The ability to achieve a desired effect under specified (performance) standards and conditions through combinations of ways and means (activities and resources) to perform a set of activities. (DoD 2009)
(2) The ability to undertake a particular kind of action or the extent of someone's or something's ability. (Wikipedia 2010, 1)
(3) The quality of being capable; to have the capacity or ability to do something, achieve specific effects or declared goals and objectives. (Wikipedia 2010)
(4) The ability to execute a specified course of action. It is defined by a user and expressed in non-equipment based operational terms. (MOD 2004) N.B.: In MODAF, the term capability refers to ‘military capability’ including all defense lines of development (DLODs); rather than ‘equipment capability’ that refers solely to the capability of the equipment, system, or system of systems. Sometimes it is necessary to distinguish between a required capability (i.e., what is sought) and the fielded capability (i.e., the currently available capability that consists of equipment and the supporting DLODs.)
The ability to execute a specified course of action. A capability may or may not be accompanied by an intention.
(1) DoD. 2009. DOD architecture framework (DODAF), version 2.0. Washington, DC: U.S. Department of Defense (DoD).
(3) Wikipedia contributors, "Capability management," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/w/index.php?title=Capability_management&oldid=417142669 (accessed June 7, 2011).
(4) MOD. 2004. Ministry of defence architecture framework (MODAF), version 2. UK: U.K. Ministry of Defence.
(5) DoD. 2009. "Department of Defense Dictionary of Military and Associated Terms", Joint Publication 1-02, DoD, 17 March 2009.