from
The Collaborative International Dictionary of English v.0.48
Cotillon \Co`til`lon"\ (k[-o]`t[-e]`y[^o]N" or k[-o]`t[-e]l`-;
277), Cotillion \Co*til"lion\ (k[-o]*t[i^]l"y[u^]n), 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.
[1913 Webster]
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]