deb ‧ u ‧ tante /ˈdebjʊtɑːnt/ BrE AmE ( also deb informal ) noun [countable]
[ Date: 1800-1900 ; Language: French ; Origin: débutante , from débuter ; ⇨ ↑ debut 1 ]
a young rich ↑ upper-class woman who starts going to fashionable events as a way of being introduced to upper-class society