I. noun 1. [in sing., with infinitive] — possession of the means or skill to do something • the manager had lost his ability to motivate the players.
2. [ mass noun] — talent, skill, or proficiency in a particular area • a man of exceptional ability
• [ count noun]
pupils of all abilities.
II. phrases to the best of one’s ability as well as one can • Conrad must do his job to the best of his abilities.
– origin late Middle English: from Old French ablete, from Latin habilitas, from habilis ‘able’.