Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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base line

base line

 
pronunciation:
beIs laIn
part of speech: noun
definition 1: in baseball, the area within which a runner must stay while running from base to base.
definition 2: the line at either end of a tennis court that marks the back boundary.
definition 3: a line used as a base, as in measurement or surveying.