(physics) A hypothetical particle having an isolated north or south pole; the magnetic equivalent of an isolated electric charge.

(physics) The torque exerted on a magnet within a magnetic field; a vector, being the product of the strength of the magnet and the distance between its poles.

(physics) a magnetic field with axial symmetry capable of converging a beam of charged particles of uniform velocity and of forming images of objects placed in the path of such beam

(physics) a thermometer whose operation is based upon Curie's law; typically used to measure temperatures below 1 K

Any of several reversals in the polarity of the Earth's magnetic field (such that a compass points South) that have happened over geologic time.

(physics) a measure of the magnetization of a material per unit of applied magnetic field

(physics) A measure of the strength of a magnetic field in a given area.

(military) A mine which responds to the magnetic field of a target.

(electromagnetism) A closed path of magnetic flux.

(nautical, navigation) Directional bearing relative to the nearest magnetic pole, as shown by a compass.