The horizontal angle between magnetic north and true north at a given place.

The magnetization of an igneous rock that was acquired at the time it cooled from the molten state; it provides information on the Earth's magnetic field at that time.

(nautical) Any of several small bar magnets placed and adjusted within a ship's binnacle to correct for the effects of other magnetic influences in the ship.

(physics) A material, or piece of such material, which retains its magnetism even when not subjected to any external magnetic fields.

(military) A line drawn on a map or chart connecting all points at which the magnetic inclination (dip) is zero for a specified epoch.

(physics) The potential energy of a magnetic field.

(slang, US) A man who continually meets and attracts women.

(slang, vulgar) A man or thing that attracts women.

plural of magnetic recording

(physics) The dependence of any magnetic property of a material on the direction in which it is measured.