debut (Noun) — The act of starting something for the first time; introducing something new. ex. "they looked forward to the debut of their new product line"
debut (Noun) — The presentation of a debutante in society.
debut (Verb) — (performing arts) present for the first time to the public. ex. "The band debuts a new song or two each month"
debut (Verb) — (performing arts) appear for the first time in public. ex. "The new ballet that debuts next months at Covent Garden, is already sold out"
debut (Verb) — (performing arts) make one's debut. ex. "This young soprano debuts next month at the Metropolitan Opera"