Pronunciation: (l-ten'unt in Brit. use, except in the navy, lef-ten'unt), [key]
— n.
Seefirst lieutenant.
Seesecond lieutenant.
a commissioned officer ranking between lieutenant junior grade and lieutenant commander.
a person who holds an office, civil or military, in subordination to a superior for whom he or she acts: If he can't attend, he will send his lieutenant.