Definition of first lieutenant

first lieutenantnoun

trung úy

/ˌfɜːst lefˈtenənt//ˌfɜːrst luːˈtenənt/

namespace

an officer in the navy with responsibility for managing a ship, etc. under the guidance of the captain

an officer in the US army and air force just below the rank of a captain

a person who is the next most important to somebody