lieutenant

A commissioned rank in the US Navy or Coast Guard that is above lieutenant junior grade and below lieutenant commander.

A first lieutenant.

A second lieutenant.

One who holds the rank of lieutenant, first lieutenant, or second lieutenant.

A commissioned officer in the British and Canadian navies ranking just below a lieutenant commander.

An officer in a police or fire department ranking below a captain.

One who acts in place of or represents a superior; an assistant or deputy.

In archery, the winner of a lieutenancy in a shooting-match.

In general, one who holds the place of another in the performance of any duty or function; one authorized to act in lieu of another, or employed to carry out his will or purposes; the substitute or representative of a superior.