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e region is a noun meaning "a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length". It carries one recorded sense.
a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
Definitions, synonyms and semantic relations for e region come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.