(UK, informal) A film assigned an age rating of 15, those under 15 not being permitted to view it.
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(bibliography, informal) A book or other printed item that was printed in the 15th century (thus, during the first half-century of printing).
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Add your own interpretation of "fifteener".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.