first lieutenant
noun /ˌfɜːst lefˈtenənt/
/ˌfɜːrst luːˈtenənt/
- an officer in the navy with responsibility for managing a ship, etc. under the guidance of the captain Topics War and conflictc2
- an officer in the US army and air force just below the rank of a captainTopics War and conflictc2
- (informal) a person who is the next most important to somebody