lieutenant

noun

1. (US)The lowest junior commissioned officer rank(s) in many military forces, often Army and Marines.
2. (US)The lowest junior commissioned officer rank(s) in many military forces, often Army and Marines.
3. (US)The lowest junior commissioned officer rank(s) in many military forces, often Army and Marines.
4. (UK)The lowest junior commissioned officer rank(s) in many military forces, often Army and Marines.
5. (UK)The lowest junior commissioned officer rank(s) in many military forces, often Army and Marines.
6. (Australia, Canada, New-Zealand)The lowest junior commissioned officer rank(s) in many military forces, often Army and Marines.
7. A person who manages or executes the plans and directives of another, more senior person; a manager to their director.

   “Mr. Scott immediately asked someone at Microsoft’s headquarters in Redmond, Wash., to get Mr. Nadella, the chief executive, out of a meeting he was having with top lieutenants.”

8. The second-in-command (2IC) of a group.
9. (alt-of)Alternative letter-case form of lieutenant (when used as a title before a name)

adj

1. (not-comparable)A military grade that is junior to the grade the adjective modifies: lieutenant colonel, lieutenant general, lieutenant commander.