Definition of lack noun from the Oxford Advanced American Dictionary

      

    lack

     noun
    noun
    NAmE//læk//
     
    [uncountable, singular]lack (of something)
     
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  1. 1  the state of not having something or not having enough of something synonym dearth, shortage
  2. 2 a lack of food/money/skills The trip was canceled due to lack of (= because there was not enough) interest. There was no lack of volunteers. She showed a distinct lack of enthusiasm for the idea of becoming a mother.
  3. Idioms
    not for want/lack of trying
     
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    used to say that although someone has not succeeded in something, they have tried very hard They haven't won a game yet, but it isn't for want of trying.
See the Oxford Advanced Learner's Dictionary entry: lack