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co·til·lion,
also co·til·lon (kō-tĭĺyən, kə-)

[French cotillon, from Old French, petticoat diminutive of cote, coat; see coat.]

noun 

  1. A formal ball, especially one at which young women are presented to society.
    1. A lively dance, originating in France in the 18th century, having varied, intricate patterns and steps.
    2. A quadrille.
    3. Music for these dances.