bea15239_king_Group___MedBiquitous_Wiki__CWG_definition
[Term] Competency [Other definitions] Frank et al: An observable ability of a health professional, integrating multiple components such as knowledge, skills, values, and attitudes. Since competencies are observable, they can be measured and assessed to ensure their acquisition. Competencies can be assembled like building blocks to facilitate progressive development.(1) [AAMC] Use (1) [CWG definition] 
From competency framework spec: A statement describing a specific ability, or set of abilities, requiring specific knowledge, skill and/or attitude. Competencies are used to set performance standards that must be met.
Performance Framework - Definitions - Competencies Working Group - MedBiquitous Wiki
CWG definition