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A line on a map connecting points of equal magnetic declination.
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.
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|Noun||1.||isogonic line - an imaginary line connecting points on the Earth's surface where the magnetic declination is the same|
line - a spatial location defined by a real or imaginary unidimensional extent
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