The person or thing that is number one in a series or sequence. She was the first to cross the finish line in the race.
The initial occurrence or instance of something. She said sorry? That's a first!
The leading position in a competition or ranking. He took first in the national spelling bee.
The first gear of a vehicle's transmission. He shifted the car into first to start moving.
A person or thing that is considered the best or most important. In her family, education always comes first.
The highest exam result that you can achieve at the end of a university course in the UK. She graduated with a first in Physics from Oxford.
First base (in baseball). There were runners on first and third with nobody out.