an officer ranking next above second lieutenant and next below a captain.
the officer responsible for the upkeep and maintenance of a warship, esp the executive officer of a smaller ship in the Royal Navy
an officer holding commissioned rank in the US Army, Air Force, Marine Corps, or in certain other forces, senior to a second lieutenant and junior to a captain
noun, Southern U.S. 1. . noun 1. the time when light first appears in the morning; dawn
[furst-lahyn] /ˈfɜrstˈlaɪn/ adjective 1. available for immediate service, especially combat service: first-line troops. 2. of prime importance or quality. adjective 1. acting or used as a first resort: first-line treatment, first-line batsmen
[furst-ling] /ˈfɜrst lɪŋ/ noun 1. the of its kind to be produced or to appear. 2. offspring. 3. a product or result. /ˈfɜːstlɪŋ/ noun 1. the first, esp the first offspring
noun, British. 1. the head of a board commissioned to perform the duties of a high office of state: First Lord of the Admiralty.