Definitions for "Fin de siècle"
Lit., end of the century; -- mostly used adjectively in English to signify: belonging to, or characteristic of, the close of the 19th century. At that time the phrase was also intended to imply "modern" or "up-to-date;" as, fin-de-siècle ideas.
Fr.- "the end of the century"] Used in art criticism it connotes the idea of a style or movement on the decline.
French phrase meaning "end of century," sometimes used to refer to the Aesthetes or the Decadents of the late nineteenth century.