ca·pac·i·ty n pl -ties
1: a qualification, power, or ability (as to give consent or make a testament) created by operation of law
2: an individual's ability or aptitude; esp: mental ability as it relates to responsibility for the commission of a crime (as murder) see also diminished capacity compare competency, incapacity, insanity
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.