fifteener

1. (UK, informal) A film assigned an age rating of 15, those under 15 not being permitted to view it.Examples: "Not intensely bloody decapitation, but the sort of violence you'd see in a fifteener."UKinformal

2. (bibliography, informal) A book or other printed item that was printed in the 15th century (thus, during the first half-century of printing).Examples: "When here and there throughout those volumes you meet with titles of books now either unknown entirely or of the greatest rarity; when you find the Colophon from the end or the "insignum typographi" from the first leaf of a rare "fifteener" pasted down with dozens of others varying in value, you cannot bless the memory of the antiquarian shoemaker, John Bagford."Synonyms: incunabulum, incunableinformal