A fiancée was a woman who was engaged to be married.
The Cameca was the First Doctor's fiancée whilst he was in 15th century Mexico. (TV: The Aztecs)
Nyssa looked exactly like George Cranleigh ex-fiancée Ann Talbot. (TV: Black Orchid)
Jonos was shocked to discover that his fiancée was actually the Rani. (PROSE: Something Borrowed)
Lance Bennett was dosing the coffee of his fiancée Donna Noble with Huon particles by order of the Empress of the Racnoss, whom he secretly served. (TV: The Runaway Bride)
Daisy Conlan, the fiancée of Oliver Marks, was killed by the Tahnn. Using the Glamour, Oliver created a temporal illusion of her. (PROSE: The Glamour Chase)
Owen Harper's fiancée, Katie Russell, was killed by an alien parasite in her brain. (TV: Fragments)