The term 'Cotillion STAR' is a reference to a type of dance popular in the 18th century. The word cotillion is derived from the French word for petticoat, and it was a type of dance that involved intricate steps and figures. The term 'STAR' refers to the lead dancer in the cotillion, who was usually the most skilled and experienced dancer. The crossword solution for this term is DEB, which stands for debutante ball. A debutante ball is a formal event where young women are presented to society, and it often includes a cotillion dance.