: a group of fans for a particular sport, musical group, celebrity, book or film franchise, etc.
… the Los Angeles Lakers and the Milwaukee Bucks—the last two NBA champions—had fan bases spending the most money on team merchandise and gear. Corey Davis
Yet her three albums with the Epic label failed to earn her a popular audience, beyond country's traditional fan base … Martha A. Hostetter
But sales figures don't fully capture the fan base among shojo readers, who can whip through a volume in half an hour in a bookstore and often pass along copies to friends. Sarah Glazer
The fervent passion of [Justin] Bieber's fan base almost obscured the rampant self-indulgence of his hour-and-a-half set. Ben Fisher