[ jee-oh-mag-ni-tiz-uh m ]
/ ˌdʒi oʊˈmæg nɪˌtɪz əm /


the earth's magnetic field and associated phenomena.
the branch of geophysics that studies such phenomena.

Origin of geomagnetism

First recorded in 1935–40; geo- + magnetism Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for geomagnetism

/ (ˌdʒiːəʊˈmæɡnɪˌtɪzəm) /


the magnetic field of the earth
the branch of physics concerned with this

Derived forms of geomagnetism

geomagnetic (ˌdʒiːəʊmæɡˈnɛtɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for geomagnetism

[ jē′ō-măgnĭ-tĭz′əm ]

The magnetic properties of the Earth and its atmosphere.
The study of these properties.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.