the.com/debutante

A young woman presented to society in a white dress, as if eligibility expires.

means A young woman, typically of upper-class background, formally introduced into society at a coming-out event, historically to signal she was now ready for courtship and marriage.

from From French débutante, the feminine form of débutant, 'one who is beginning' — rooted in débuter, 'to begin' or make a first move, a term borrowed from games like billiards where it meant going first. The word crossed into English in the 1700s-1800s attached to the ritual of the 'coming-out' ball, where the 'beginning' in question was a young woman's official entrance into marriageable society — her social debut, performed in white and under scrutiny.

origin
French for one who leads off
the ball
traditionally marked marriageable age, not achievement
modern form
mostly pageantry, scholarship funding, and curtsies
the gown
always white, symbolizing purity on parade
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