base line

(bāslīn′)

noun

noun

    1. a line serving as a base
    2. any starting or reference point, figure, amount, level, etc. with which others can be measured or compared
    3. Surveying a horizontal line measured with special accuracy to provide a base for survey by triangulation
  1. Baseball the unmarked lane, six feet (1.8 m) wide, between any two consecutive bases: a base runner must normally stay within this lane
  2. Basketball end line; esp., an area of the court just inside this line
  3. Tennis the line at the back at either end of the court
Also baseline

noun

See base line in American Heritage Dictionary 4

or base·line

noun
  1. a. A line serving as a basis, as for measurement, calculation, or location.
    b. A measurement, calculation, or location used as a basis for comparison.
  2. Baseball The base path.
  3. Sports
    a. The boundary line at either end of a court, as in basketball or tennis.
    b. The area near this boundary line: made a basket from the base line.
    c. A style of play in tennis in which the player remains near the base line and rarely approaches the net.

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