The term "premiere" has two meanings, both related to the world of entertainment.
1) In its broadest sense, a premiere refers to the first public showing or performance of any kind - be it a film, play, musical composition, art exhibition, or even a book reading. It is the debut event that marks the beginning of something new and signals its availability for others to experience.
2) In the context of cinema, "premiere" specifically refers to the first public screening of a motion picture, usually attended by the film's cast, crew, and other VIP guests. It is often accompanied by red carpet events, press conferences, and other forms of promotion to generate buzz around the release of the movie.