Diamagnetism

n.	1.	The science which treats of diamagnetic phenomena, and of the properties of diamagnetic bodies.
	2.	The magnetic action which characterizes diamagnetic substances, the magnetic moments of which tend to oppose an externally applied magnetic field. Contrasted with paramagnetism and ferromagnetism.

Noun

1.

diamagnetism - phenomenon exhibited by materials like copper or bismuth that become magnetized in a magnetic field with a polarity opposite to the magnetic force; unlike iron they are slightly repelled by a magnet

magnetic attraction, magnetic force, magnetism