magnetic declination definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The angle between magnetic north and true north at a particular location. Also called magnetic variation.
magnetic declination - Science Definition
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.