Mitt, dear chap, one is delighted to escort Muffy to the cotillion.
A toy harness from the cotillion favors jangled on her dress.
I simply said I wanted to be excused from taking her to the cotillion.
I will get an invitation for you, and will keep the cotillion for you.
During the encampment we have a hop three times a week—a cotillion party.
More interesting to them than any other dancers were naturally Brenda and Manlio, partners for the cotillion.
Kitty was giving a cotillion, an event of some importance in Woodford.
They then dance a sort of cotillion, as the ladies described it, going through a number of evolutions with their swords.
The shopwoman displayed her assortment of cotillion objects.
The climax came when he asked to be excused from the Moore cotillion because he had three other dances for that week.
type of dance, 1766, from French cotillion (15c.), originally "petticoat," a double diminutive of Old French cote "skirt" (see coat (n.)); its application to a kind of dance arose in France and is considered obscure by some linguists, but there are lively turns in the dance that flash the petticoats.
Meaning "formal ball" is 1898, American English, short for cotillion ball. French uses -on (from Latin -onem) to reinforce Latin nouns felt to need more emphatic power (e.g. poisson from Latin piscis). It also uses -on to form diminutives, often strengthened by the insertion of -ill-, as in the case of this word.