lieutenant

Universal Words noun (abbreviation Lieut., Lt) 1 an officer of middle rank in the army, navy, or air force: Lieutenant Paul Fisher seealsoFLIGHTLIEUTENANT, SECONDLIEUTENANT, SUBLIEUTENANT 2 (in compounds) an officer just below the rank mentioned: a lieutenant colonel * Lieutenant Commander Browning 3 (in the US) a police officer of fairly high rank 4 a person who helps sb who is above them in rank or who carries out their duties when that person is unable to