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Longman Dictionary of Contemporary English
first lieutenant
noun
EXAMPLES FROM CORPUS
▪ A first lieutenant was the highest-ranking officer at the scene.
▪ And Graham Gooch's first lieutenant Stewart, the Surrey skipper, will be a key witness at a committee of inquiry.
▪ He was promoted first lieutenant in November 1914 and captain nine months later.
▪ The first lieutenant also refused and also went below.
▪ The yeoman informed him that the public information officer was also the base first lieutenant and had important business else-where.
▪ This was Mark Rhoads, a first lieutenant in the Signal Corps who had been carefully selected for the assignment.
▪ We know that you have commanded a submarine and the Lieutenant-Commander was your first lieutenant.
Wiktionary
first lieutenant

n. 1 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. 2 An equivalent rank in other military forces.

WordNet
first lieutenant

n. a commissioned officer in the army or air force or marines ranking above a 2nd lieutenant and below a captain

Wikipedia
First lieutenant

First lieutenant is a commissioned officer military rank in many armed forces and, in some forces, an appointment.

The rank of lieutenant has different meanings in different military formations (see comparative military ranks), but the majority of cases it is common for it to be sub-divided into a senior (first lieutenant) and junior (second lieutenant) rank. In navies it may relate to a particular post rather than a rank.

Usage examples of "first lieutenant".

He was first lieutenant now, he was one of the officers who had acquiesced, if nothing more, in the displacement of Sawyer from command, and it would take a victory to invest him with any virtue at all in the eyes of his superiors.

It was to Bush's credit that he felt sorrow at the death of Roberts before his mind recorded the fact that he was now first lieutenant of a ship of the line.

The man was at least a couple of centimeters taller than she was, with broad shoulders and a face that actually had a sort of rough handsomeness, and he wore the insignia of a first lieutenant in the People’.

The man was at least a couple of centimeters taller than she was, with broad shoulders and a face that actually had a sort of rough handsomeness, and he wore the insignia of a first lieutenant in the People's Marines, which she assumed denoted the same rank for State Security ground forces, as well.

Ormerod said, to which his first lieutenant nodded emphatic agreement.

The tired and dirty first lieutenant was the last officer the cavalry company had left.