base·line

[beys-lahyn]
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.
00:10
Baseline is always a great word to know.
So is zedonk. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.

Origin:
1740–50; base1 + line1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
baseline (ˈbeɪsˌlaɪn) [Click for IPA pronunciation guide]
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

baseline
1750, originally in surveying, from base (n.) + line (n.). Baseline estimate in use by 1983.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

baseline definition


released version

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
So-called information gain and travel utility increase the farther you get from
  home and from your baseline comfort level.
Each accomplishment only lifts one up to a new baseline of expectations.
Additionally, an availability baseline that was established when your
  application was small may not be relevant any more.
The first phase of today's procedure is a baseline interval that maps the
  activity of my brain at rest.
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