second lieutenantsecond lieutenant
- The lowest commissioned rank in the US Army, Air Force, and Marine Corps.
- One who holds this rank.
(plural second lieutenants)
When used as a title, it is always capitalized.
- Example: Second Lieutenant Jane Doe.
The rank corresponds to pay grade O-1. Abbreviations: 2LT (Army), 2ndLt (Marine Corps), 2d Lt (Air Force).