always go to the fundamentals

competency :: "The combination of observable and measurable knowledge, skills, abilities and personal attributes that contribute to enhanced employee performance and ultimately result in organizational success. "

that is one definition used by one organization. I think it suggests there is no simple easy definition for competency but is a complex algorithm used to measure success.

I'll let the reader decide whether Mr Trump has demonstrated any competence in his current reality show.
_________________________
ignorance is the enemy
without equality there is no liberty