Definition of baseline noun from the Oxford Advanced American Dictionary

     

    baseline

     noun
    noun
    NAmE//ˈbeɪslaɪn//
     
    [usually singular]
     
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  1. 1(sport) a line marking each end of the court in tennis or the edge of the area where a player can run in baseball
  2. 2(technology) a line or measurement that is used as a starting point when comparing facts The figures for 2009 were used as a baseline for the study.
See the Oxford Advanced Learner's Dictionary entry: baseline