The American Heritage® Dictionary of the English Language, 4th Edition
n. Informal One, such as a studio or producer, that is unaffiliated with a larger or more commercial organization.
n. Informal An artistic work produced by an independent company or group: "[His film] showed that indies could . . . take in millions at the box office” ( Liesl Schillinger).
adj. Of, relating to, or being an indie: an album of indie rock; an indie film company.