noun

1. The lowest Junior Commissioned Officer rank(s) in many military forces, often Army and Marines.

2. A person who manages or executes the plans and directives of another, more senior person - i.e. a manager to his director.

3. The second-in-command (2IC) of a group.

Synonyms: LT, LT., Lieut, Lieut., Lt., lieut, lieut.

adjective

1. A military grade that is junior to the grade the adjective modifies: lieutenant colonel, lieutenant general, lieutenant commander.