"debut" in the noun sense
1. introduction, debut, first appearance, launching, unveiling, entry
the act of beginning something new
"they looked forward to the debut of their new product line"
the presentation of a debutante in society
"debut" in the verb sense
present for the first time to the public
"The band debuts a new song or two each month"
appear for the first time in public
"The new ballet that debuts next months at Covent Garden, is already sold out"
make one's debut
"This young soprano debuts next month at the Metropolitan Opera"
Source: WordNet® (An amazing lexical database of English)
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