an ocean bounded by North America and South America in the Western Hemisphere and by Europe and Africa in the Eastern Hemisphere. ab. 31,530,000 sq. mi. (81,663,000 sq. km); with connecting seas ab. 41,000,000 sq. mi. (106,100,000 sq. km); greatest known depth, 30,246 ft. (9219 m).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.