Co-pilot (noun)

1. A pilot who assists the captain or the primary pilot in flying an aircraft.
2. A secondary or assistant operator of a vehicle or machine.

Origin:

Derived from the prefix 'co-' meaning together and 'pilot' meaning a person who guides or operates a vehicle or machine.

Examples:

1. The co-pilot was responsible for monitoring the flight instruments and communicating with air traffic control.
2. The co-pilot took over the controls and safely landed the plane when the captain became unconscious.
3. The co-pilot was trained to handle emergencies and assist the captain as needed.
4. The co-pilot had years of experience flying different types of aircraft.
5. As the co-pilot, he had to be ready to take control at a moment's notice.