I just read the obituary of a writer, and it mentions his first "fiction novel." I've seen this redundant construction multiple times lately, implying that a novel can be something other than fiction. The American Heritage Dictionary, as good a source as any, defines "novel" as "a fictional prose narrative of considerable length" and that's the definition I've always understood to be the prevailing one.
On the other hand, a number of memoirs have recently been revealed as fiction, thus splitting that genre into "non-fiction memoir" and "fiction memoir."
Except that there's already a word for a "fiction memoir."
It's called a novel.