Definition of brightness noun from the Oxford Advanced Learner's Dictionary

     

    brightness

     noun
    noun
    BrE BrE//ˈbraɪtnəs//
     
    ; NAmE NAmE//ˈbraɪtnəs//
     
    [uncountable]
     
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  1. 1the fact of being full of light or of shining strongly She was momentarily blinded by the brightness of the room.
  2. 2how bright something is to adjust the brightness (= for example, on a TV set) As the brake is applied, the light increases in brightness.
  3. 3the quality of being bright in colour Repeated use of some washing powders can lead to a loss of brightness in colours.
  4. 4a cheerful and lively attitude or way of behaving Her brightness and energy kept us all together.
  5. 5the quality of being intelligent and quick to learn The brightness of these students isn't in doubt.