[ beys-lahyn ]
/ ˈbeɪsˌlaɪn /

noun Also base line.


basic or essential.

Origin of baseline

First recorded in 1740–50; base1 + line1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples 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

Word Origin and History for baseline



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