[ lɛf'tɛnənt ]
■ noun
1》 a deputy or substitute acting for a superior.
2》 a rank of officer in the British army, above second ~ and below captain.
3》 a rank of officer in the navy, above sub ~ and below ~ commander.
4》 (in the US) a police officer next in rank below captain.
Derivatives
lieutenancy noun ( plural lieutenancies ).
Origin
ME: from OFr. (see lieu , tenant ).