<p><strong>Adjective</strong></p><ul><li>before or existing before a war, especially the American Civil War; prewar: the antebellum plantations of Georgia.</li></ul><p><strong>Noun</strong></p><ul><li>the continent surrounding the South Pole: almost entirely covered by an ice sheet. About 5,000,000 sq. mi. (12,950,000 sq. km).</li></ul>