A performer's first performance to the public, in sport, the arts or some other area.

The first public presentation of a theatrical play, motion picture, opera, musical composition, dance, or other performing arts piece.

“Since making its debut two years ago, the program has gained cult status.”

The first appearance of a debutante in society.

To formally introduce, as to the public

“Amalgamated Software Systems debuted release 3.2 in Spring of 2004.”

To make one's initial formal appearance

“Release 3.2 debuted to mixed reviews in Spring of 2004.”