Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Watermerchant navyˌmerchant ˈnavy British English, merchant marine American English noun [singular] BTTWall of a country’s ships that are used for trade, not war, and the people who work on these ships John worked as a chef in the merchant navy.Examples from the Corpusmerchant navy• The importance of the merchant navy in the formation of the maritime culture in North Shields was very great. ldoceonline.com