the last and most important game, race, or set of games in a competition
be through to/reach the final
He's through to the men's tennis final for the first time.
the finals (=the last few games or races in a competition)
the NBA finals
2 [plural] British English
the set of examinations that students take at the end of their time at university [= final exams]
sit/take your finals
Anna sat her finals last summer.
3 American English
an important test that you take at the end of a particular class in high school or college