First Lieutenant Definition
    noun
  
 An officer ranking above a second lieutenant and below a captain.
 Webster's New World 
One who holds this rank.
 American Heritage 
The officer in charge of maintenance of a ship or shore station.
 Webster's New World 
Synonyms: 
  
- 1st lieutenant
Other Word Forms of First Lieutenant
Noun
Singular:
 first lieutenantPlural:
 first-lieutenantsFirst Lieutenant Is Also Mentioned In
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