Definition of first lieutenant First lieutenant

first lieu•ten•ant

We found 3 definitions of first lieutenant from 2 different sources.

What does first lieutenant mean?

Noun
first lieutenant - a commissioned officer in the Army or Air Force or Marines ranking above a 2nd lieutenant and below a captain
		1st lieutenant

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first lieutenant (Noun)
The second lowest rank of a commissioned officer in the United States Army, Air Force, or Marine Corps, ranking above a second lieutenant and below a captain. The rank of first lieutenant is equivalent to the naval rank of lieutenant junior grade .
first lieutenant (Noun)
An equivalent rank in other military forces.