Also found in: Thesaurus, Acronyms, Encyclopedia, Wikipedia.
1. A meridian used as a reference line from which longitude east and west is measured.
2. Prime Meridian The meridian passing through Greenwich, England, designated as the zero meridian (0°) by an international conference in 1884.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) the 0° meridian from which the other meridians or lines of longitude are calculated, usually taken to pass through Greenwich
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the meridian running through Greenwich, England, from which longitude east and west is reckoned.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
The meridian with a longitude of 0°, used as a reference line from which longitude east and west is measured. It passes through Greenwich, England.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An imaginary north-south line of longitude that passes through Greenwich, England, and is used as the basis for longitudinal measurements on the globe.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
Switch to new thesaurus
|Noun||1.||prime meridian - meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)|
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.