Definition of geomagnetism noun from the Oxford Advanced American Dictionary

 

geomagnetism

 noun
noun
NAmE//ˌdʒioʊˈmæɡnəˌtɪzəm//
 
[uncountable](geology)
 
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the study of the magnetic characteristics of the earth
geomagnetic
 
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NAmE//ˌdʒioʊmæɡˈnɛt̮ɪk//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: geomagnetism