The debut of a performer or sports player is their first public performance, appearance, or recording. Dundee United's Dave Bowman makes his international debut. her debut album `Sugar Time'. the first public appearance of an entertainer, sports player etc or of something new and important sb's debut (début, from débuter , from but )
the presentation of a debutante in society appear for the first time in public; "The new ballet that debuts next months at Covent Garden, is already sold out"