IPA: //ˈdɛb.jʊ.tɒnt//
KK: /ˈdɛbjuˌtɑnt/
A young woman who is being introduced to society for the first time, often at a formal event.
The debutante wore a beautiful gown to her coming-out party.
Debutante is derived from the French word 'débutante' (meaning beginner or novice), which comes from 'début' (meaning to begin). The suffix '-ante' indicates a person who is performing an action. Thus, a debutante is a person who is beginning their formal introduction into society.
Think of someone who is 'beginning' ('début') their journey into society — that's what a debutante represents.