[ beys-lahyn ]
/ ˈbeɪsˌlaɪn /
Save This Word!

noun Also base line .


basic or essential.



Are you aware how often people swap around “their,” “there,” and “they’re”? Prove you have more than a fair grasp over these commonly confused words.
Question 1 of 7
Which one of these commonly confused words can act as an adverb or a pronoun?

Origin of baseline

First recorded in 1740–50; base1 + line1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for baseline

British Dictionary definitions for baseline

/ (ˈbeɪsˌlaɪn) /


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

Medical definitions for baseline

base line


A line corresponding to the base of the skull, passing from the infraorbital ridge to the midline of the occiput, through the ear canal.
A line serving as a basis, as for measurement or calculation.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
See Today's Synonym