Debut (noun)

1. A first appearance, performance, or public showing.
2. A person's first appearance in a particular capacity or role.

Origin:

From french début ("a beginning"), from old french debut, from de- + but.

Examples:

1. She made her professional debut in the play.
2. The musician's debut album was a huge success.
3. The dancer made his debut on Broadway.
4. The movie was a highly anticipated debut for the director.
5. The team's debut performance in the tournament was a surprising loss.