Tennis. the line at each end of a tennis court, parallel to the net, that marks the in-bounds limit of play.
(in perspective drawing) a horizontal line in the immediate foreground formed by the intersection of the ground plane and the picture plane.
a basic standard or level; guideline: to establish a baseline for future studies.
a specific value or values that can serve as a comparison or control.
Typography. the imaginary line on which the bottoms of primary letters align.
Surveying. See under triangulation (def. 1).
Electronics. a horizontal or vertical line formed on the face of a cathode-ray tube by the sweep of the scanning dot.
Naval Architecture. a line on the body plan or sheer plan of a hull, representing a horizontal reference plane for vertical dimensions.
basic or essential.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use baseline in a sentence
But General Lee abandoned the salient after dark, and put his whole force in the base line.Historic Fredericksburg | John T. Goolrick
A base line permanently fixed on the ship is the one side of a triangle required.Steam Steel and Electricity | James W. Steele
It was on the base line and 15 feet north of the copper find before described.The Swastika | Thomas Wilson
Webb set up the theodolite while Hurley and I paced out a half-mile base-line to find out the intervening distance.The Home of the Blizzard | Douglas Mawson
Every circle has 360 degrees, and when a certain degree is mentioned, it means a certain angle from what is called a base line.Practical Mechanics for Boys | J. S. Zerbe
British Dictionary definitions for baseline
surveying a measured line through a survey area from which triangulations are made
an imaginary line, standard of value, etc, by which things are measured or compared
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