Meaning of “debut” - Learner’s Dictionary

debut

noun [ C ] uk us /ˈdeɪbjuː/ US  /deɪˈbjuː/

the first time someone performs or presents something to the public:

She made her debut as a pianist in 1975.
This is the band's debut album.

(Definition of “debut” from the Cambridge Learner’s Dictionary © Cambridge University Press)