Wiktionary
alt. (context US English) A professional dance partner. n. (context US English) A professional dance partner.
WordNet
n. a woman employed to dance with patrons who pay a fee for each dance
Wikipedia
A taxi dancer is a paid dance partner in a partner dance. Taxi dancers are hired to dance with their customers on a dance-by-dance basis. When taxi dancing first appeared in taxi-dance halls during early 20th-century America, male patrons would buy dance tickets for ten cents each. When a patron presented a ticket to a chosen taxi dancer, she would dance with him for the length of a single song. The taxi dancers would earn a commission on every dance ticket earned. Though taxi dancing has for the most part disappeared in the United States, it is still practiced in some other countries.