Pronunciation: (flēt),[key] —n. 1. the largest organized unit of naval ships grouped for tactical or other purposes.
2. the largest organization of warships under the command of a single officer.
3. a number of naval vessels or vessels carrying armed crew members.
4. a large group of ships, airplanes, trucks, etc., operated by a single company or under the same ownership: He owns a fleet of cabs. 5. a large group of airplanes, automobiles, etc., moving or operating together.