1. noun A program of two feature-length films shown one after the other, or (by extension) any program featuring two primary events back-to-back. They are showing the original film and its sequel in a fantastic double bill this Friday! Both the governor and state senator will speak as part of a double bill at the fundraising gala later this evening.

2. verb To play a film as part of a double feature (i.e., to show it immediately before or after another). Often hyphenated. They're going to double-bill the sequel alongside the original film this Friday.

3. verb To charge separate accounts for the same cost. The lawyer was disbarred for double-billing his clients and the state for dozens of cases during his career.