Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A change in the polarity of a magnetic field in which magnetic north and south are reversed.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Any of several reversals in the
polarity of theEarth 'smagnetic field (such that a compass points South) that have happened overgeologic time.
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