GNU Collaborative International Dictionary of English
Found one definition
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‖Cotillon (kṓˌtḗˌyôNˈ or kṓˌtḗlˌ-; 277), Cotillion (kṓ‑tĭlˈyŭn), n. [F. cotillon, fr. OF. cote coat, LL. cotta tunic. See Coat.]
1. A brisk dance, performed by eight persons; a quadrille.
[1913 Webster]
2. A tune which regulates the dance.
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3. A kind of woolen material for women's skirts.
4. A formal ball, especially one at which debutantes are first presented to society.
[1913 Webster +PJC]