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Definition of Magnetic variation
1. Noun. The angle (at a particular location) between magnetic north and true north.
Definition of Magnetic variation
1. Noun. (context: military nautical navigation) 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. ¹
2. Noun. (cartography) In cartography, the annual change in direction of the horizontal component of the Earth’s magnetic field. ¹
¹ Source: wiktionary.com