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Meaning of geomagnetism

ge•o•mag•net•ism

Pronunciation: ( jē"ō-mag'ni-tiz"um), [key]
— n.
  1. the earth's magnetic field and associated phenomena.
  2. the branch of geophysics that studies such phenomena.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.