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baseline

[beys-lahyn] /ˈbeɪsˌlaɪn/
noun, Also, base line
1.
Baseball. the area between bases within which a base runner must keep when running from one base to another.
2.
Tennis. the line at each end of a tennis court, parallel to the net, that marks the in-bounds limit of play.
3.
(in perspective drawing) a horizontal line in the immediate foreground formed by the intersection of the ground plane and the picture plane.
4.
a basic standard or level; guideline:
to establish a baseline for future studies.
5.
a specific value or values that can serve as a comparison or control.
6.
Typography. the imaginary line on which the bottoms of primary letters align.
7.
Surveying, See under triangulation (def 1).
8.
Electronics. a horizontal or vertical line formed on the face of a cathode-ray tube by the sweep of the scanning dot.
9.
Naval Architecture. a line on the body plan or sheer plan of a hull, representing a horizontal reference plane for vertical dimensions.
adjective
10.
basic or essential.
Origin of baseline
1740-1750
1740-50; base1 + line1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for baseline

baseline

/ˈbeɪsˌlaɪn/
noun
1.
(surveying) a measured line through a survey area from which triangulations are made
2.
an imaginary line, standard of value, etc, by which things are measured or compared
3.
a line at each end of a tennis court that marks the limit of play
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for baseline
n.

also base-line, 1750, originally in surveying, from base (n.) + line (n.). Baseball diamond sense is from 1867. Baseline estimate in use by 1983.

Online Etymology Dictionary, © 2010 Douglas Harper
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baseline in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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