noun
Usage: capitalized E
: the lowest well-defined layer of the ionosphere regularly occurring during the daytime at about 60 miles above the earth's surface and capable of reflecting radio waves of medium frequency — compare e region
noun
Usage: capitalized E
: the lowest well-defined layer of the ionosphere regularly occurring during the daytime at about 60 miles above the earth's surface and capable of reflecting radio waves of medium frequency — compare e region
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012