Footage is a section of film or video that's been shot or recorded. A TV news station might play dramatic footage of a tornado's aftermath.
A film clip or a scene from a movie in production are both footage. Part of a film editor's job is combining all the best footage into a longer piece. Another kind of footage is a way to measure space — when you're selling a house, you'll need to advertise its size, or square footage. The film meaning dates from 1916, from foot as a unit of measurement, in this case of a length of film.
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