lieutenant
nounDefinition of lieutenant
1a
: an official empowered to act for a higher official
The king's lieutenant handled the problem.
b
: an aide or representative of another in the performance of duty : assistant
Her best lieutenant was working on the proposal.
2a(1)
: first lieutenant
(2)
: second lieutenant
b
: a commissioned officer in the navy or coast guard ranking above a lieutenant junior grade and below a lieutenant commander
c
: a fire or police department officer ranking below a captain
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