baseline


base·line

noun, often attributive \ˈbās-ˌlīn\

Definition of BASELINE

1
:  a line serving as a basis; especially :  one of known measure or position used (as in surveying or navigation) to calculate or locate something
2
a :  either of the lines on a baseball field that lead from home plate to first base and third base and are extended into the outfield as foul lines
b :  base path
3
:  a boundary line at either end of a court (as in tennis or basketball)
4
:  a usually initial set of critical observations or data used for comparison or a control
5
:  a starting point <the baseline of this discussion>

First Known Use of BASELINE

1610

base·line

noun, often attributive \ˈbās-ˌlīn\

Full Definition of BASELINE

1
:  a main line taken as or representing a base: such as
a :  base 6b; specifically :  a line extending east and west from a chosen reference point on a principal meridian and forming with the meridian a pair of coordinate axes for locating township and section corners —used in U.S. public-land surveying
b :  the line joining the base piece and the base point in artillery fire
c :  the lowest horizontal line in a profile drawing of a ship used as a base for vertical measurements
d of a perspective drawing :  the line formed by the intersection of the ground plane and the picture plane
e :  the area within which a baseball player must keep when running between bases; also :  either of the lines on a baseball field that lead from home plate to first base and third base and are extended into the outfield as foul lines <It surprised me that I could buy a mass-produced home plate, although I don't know why it should have, considering that one can custom-order a baby nowadays. … I installed it carefully, securely, like a grave marker, then laid out a batter's box and . — W. P. Kinsella, Shoeless Joe, 1982>
f :  a boundary line at either end of a court (as in tennis or basketball)
g :  the lower horizontal guideline for aligning capitals in freehand lettering
h :  a known quantity used as a control for further experimentation
2
:  a usually initial set of critical observations or data used for comparison or a control
3
:  a starting point <a kind of from which all discussions … must proceed — Nicholas Lemann>

Origin of BASELINE

1base
First Known Use: circa 1556

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base·line

noun \ˈbā-ˌslīn\   (Medical Dictionary)

Medical Definition of BASELINE

: a set of critical observations or data used for comparison or a control

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