base line
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base·line
or base line (bās′līn′)n.
1.
a. A line serving as a basis, as for measurement, calculation, or location.
b. Something, such as a set of data, used as a basis for comparison or as a control in a study: took x-rays as a baseline for observing later arthritis.
c. A starting point: Interviews with students provided the baseline of our project.
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 baseline.
c. A style of play in tennis in which the player remains near the baseline and rarely approaches the net.
base line
1. (surveying) A surveyed line established with more than usual care, to which surveys are referred for coordination and correlation.
2. (photogrammetry) The line between the principal points of two consecutive vertical air photographs. It is usually measured on one photograph after the principal point of the other has been transferred.
3. (radio navigation systems) The shorter arc of the great circle joining two radio transmitting stations of a navigation system.
4. (triangulation) The side of one of a series of coordinated triangles the length of which is measured with prescribed accuracy and precision and from which lengths of the other triangle sides are obtained by computation.
2. (photogrammetry) The line between the principal points of two consecutive vertical air photographs. It is usually measured on one photograph after the principal point of the other has been transferred.
3. (radio navigation systems) The shorter arc of the great circle joining two radio transmitting stations of a navigation system.
4. (triangulation) The side of one of a series of coordinated triangles the length of which is measured with prescribed accuracy and precision and from which lengths of the other triangle sides are obtained by computation.