Your favorite boy band might have a fandom that consists mainly of screaming pre-teens, while National Public Radio's fandom is probably mostly middle aged. If you are a fan of a singer or a series of comic books, you can say you belong to their fandom. The word has been around since the very early twentieth century, from fan, a baseball slang abbreviation of fanatic, which comes from the Latin fanaticus, "mad, or inspired by a god."