World War II.
Second World War
another name for World War II
noun 1. sekos.
adjective 1. done, made, or conducted without the knowledge of others: secret negotiations. 2. kept from the knowledge of any but the initiated or privileged: a secret password. 3. faithful or cautious in keeping confidential matters confidential; close-mouthed; reticent. 4. designed or working to escape notice, knowledge, or observation: a secret drawer; the secret police. […]
secreta se·cre·ta (sĭ-krē’tə) n. Substances secreted by a cell, a tissue, or an organ; the products of secretion.
noun 1. an agent of a secret service. 2. (loosely) a person employed to collect the military secrets of one country and relay them to another, especially a person living in a foreign country while so working for his or her own nation; spy. secret agent noun 1. a person employed in espionage