fifteener

Noun

fifteener (plural fifteeners)

1. (UK, informal) A film assigned an age rating of 15, those under 15 not being permitted to view it.
   • Not intensely bloody decapitation, but the sort of violence you'd see in a fifteener.2009 January 24, Interviews by Becky Barnicoat, “Good to meet you: The Jackson children”, in The Guardian
2. (informal) A book or other printed item that was printed in the 15th century (thus, during the first half-century of printing).
   • 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...1880, William Blades, The Enemies of Books, page 97

   Synonyms:

   incunabulum, incunable