LIEUTENANT

lieutenant. 1. A deputy of or substitute for another; one acting by vicarious authority <he sent his chief lieutenant to the meeting>.2. A composite part of the title of many government and military officials who are subordinate to others, esp. when the duties of the higher official may devolve to the subordinate <lieutenant governor>.3. In the U.S. Army, a commissioned officer next below captain. 4. In the U.S. Navy, an officer next below lieutenant commander.
[Blacks Law 8th]