Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the angle that a compass needle makes with the direction of the geographical north pole at any given point on the earth's surfaceAlso called: declination, magnetic variation
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
The horizontal angle between the true geographic North Pole and the magnetic north pole, as figured from a specific point on the Earth. Compare magnetic inclination.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.