Definition of ability noun from the Oxford Advanced American Dictionary

      

    ability

     noun
    noun
    NAmE//əˈbɪlət̮i//
     
    (pl. abilities)
     
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  1. 1[singular] ability to do something the fact that someone or something is able to do something The system has the ability to run more than one program at the same time. Everyone has the right to good medical care regardless of their ability to pay. A gentle form of exercise will increase your ability to relax. opposite inability
  2. 2[countable, uncountable] a level of skill or intelligence Almost everyone has some musical ability. He was a man of extraordinary abilities. students of mixed abilities A woman of her ability will easily find a job. I try to do my job to the best of my ability (= as well as I can).
  3. Word Familyable adjective (unable)ably adverbability noun (inability)disabled adjectivedisability noun
See the Oxford Advanced Learner's Dictionary entry: ability