The Oxford Thesaurus An A-Z Dictionary of Synonyms - ability n.

1) adeptness, aptitude, facility, faculty, capacity, power, knack, proficiency, Colloq know-how: I have perceived your ability to manipulate situations to your own advantage. 2) talent, skill, cleverness, capacity, wit, gift, genius, capability: He has such extraordinary ability it is difficult to see why he doesn't accomplish more. 3) abilities. faculty, faculties, talent(s) , gift(s) , skill(s) : Her abilities have made her one of the finest cellists of our time.