What does base line mean?

base line in AZ Dictionary

(n) A line serving as a basis, in terms of dimension, calculation, or area.
(n) A measurement, calculation, or location made use of as a basis for comparison.
(n) Baseball The base course.

base line in Sports Dictionary

steps 3ft on either side of a primary range between the basics. A runner is known as becoming out if he operates away from base line, unless he could be trying to stay away from interfering with a fielder who is in fool around with a batted baseball. by Nickolas YutzyReport definition
The white lines round the sides associated with the table. by Nickolas YutzyReport definition

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