Base-line definition

(baseball) The unmarked lane, six feet (1.8 m) wide, between any two consecutive bases: a base runner who does not stay within this lane may, in certain situations, be called out by an umpire.
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End line; esp., an area of the court just inside this line.
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(tennis) The line at the back at either end of the court.
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A line serving as a base.
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Any starting or reference point, figure, amount, level, etc. with which others can be measured or compared.
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(surveying) A horizontal line measured with special accuracy to provide a base for survey by triangulation.
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