From Fan History Wiki

multi-fandom, aka multi-media is a term meant to indicate that more than one fandom is included in the content.

[edit] History

Where did the term first appear? Who used it, when, and how?

This term can be used in connection with conventions, fanzines, vids, fanfic archives, etc.

For example, fanfiction.net is a multi-fandom fanfiction archive.

[edit] See also

• Convention
• Fanzine
• Vids