Definitions for magnetic variation
Princeton's WordNet
magnetic declination, magnetic variation, variation(noun)
the angle (at a particular location) between magnetic north and true north
Wiktionary
magnetic variation(Noun)
In navigation, at a given place and time, the horizontal angle between the true north and magnetic north measured east or west according to whether magnetic north lies east or west of true north.
magnetic variation(Noun)
In cartography, the annual change in direction of the horizontal component of the Earthu2019s magnetic field.
Dictionary of Military and Associated Terms
magnetic variation
1. In navigation, at a given place and time, the horizontal angle between the true north and magnetic north measured east or west according to whether magnetic north lies east or west of true north. See also magnetic declination. 2. In cartography, the annual change in direction of the horizontal component of the Earth
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