Occurring throughout or encompassing all offandom.
2008, Amelia Bitely, "'An Improbable Fiction': How Fans Rewrite Shakespeare", thesis submitted to Marietta College,page 70:
[…] scholars of fanfiction might instead question how this piece responds to thepanfandom trend toward feminizing one male participant in a slash relationship (alluded to in Kustritz and Jenkins).
Additionally, the multiple-fandom affordances of Livejournal have made "panfandom" FRPGs quite common-in these games, characters come from across multiple media sources and converge in a single world.
2014, Mary Frances Casper, “Family Don't End With Blood: Building theSupernatural Family”, in Lynn Zubernis, Katherine Larsen, editors,Fan Phenomena: Supernatural,page92:
Fan-run conventions such as 'Kazcon' (2007-09) and 'WinchesterCon' (founded as aSupernatural fandom event in 2007, and expanded to apanfandom event under the name 'Wincon' in 2010)[…]