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English definition of “baseline”

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baseline

noun [C usually singular] uk   /ˈbeɪs.laɪn/ us  
a line on a sports field, such as the one in tennis, that marks the end of the playing area, or the one in baseball that marks the path along which players run: She delivered a final serve from the baseline to win the match. an imaginary line used as a starting point for making comparisons: a baseline assessment
(Definition of baseline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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