Meaning offirst officerin English

Noun

1. copilot of an aircraft
2. chief mate of a merchant ship
3. executive officer on a naval vessel
   The first officer on the ship was responsible for navigation.
4. senior civil servant in a US embassy
   The US embassy appointed a first officer to oversee administrative tasks.
5. air Transport Auxiliary rank equivalent to Flight Lieutenant; auxiliary role
   In the Air Transport Auxiliary, the first officer assisted the captain during flights.
6. women's Royal Naval Service rank corresponding to Lieutenant-Commander; naval leadership
   The first officer commanded the naval base with confidence.