'Diamagnetism' definitions:

Definition of 'diamagnetism'

From: WordNet
noun
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

Definition of 'Diamagnetism'

From: GCIDE
  • Diamagnetism \Di`a*mag"net*ism\, n.
  • 1. The science which treats of diamagnetic phenomena, and of the properties of diamagnetic bodies. [1913 Webster]
  • 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. [1913 Webster +PJC]