a low level U.S. military officer in the Air Force, Army and Marines. Officer ranks (which operate separately from enlisted ranks) are categorized as O-(1-10) A Lieutenant is an O-1 or O-2. Only in the navy is this different where a Lt. is an O-2 or O-3. In Contrast a General or Admiral is an O-10.
The term can also be applied in civilian terms to refer to a second in command. As in a lieutenant governor.
I don't care... just ask some lieutenant to do it.
A mid-level commander/officer rank in many modern military forces. It can also be used to refer to a second-in-command in military or political hierarchy.
A mildly derogatory term for a Warrant Officer in the US Marine Corps, derived from the WO's insignia: a Lieutenant's bar with a series of red enamelled blocks denoting the WO's grade.
A person in the army, or marines who thinks they know everything. After about 5 years of looking like a dumbass they learn some shit and get 1st lieutenant.
Hey 2nd lieutenant the captain told you to report to the pool on the 5th floor of the parking lot. Of course it has 5 floors not 3.