Photo: Mark Hill/CBS TV studios like to throw the words “remake,” “reboot,” “revival,” and “spin-off” around, with many of them having seemingly interchangeable definitions, but what, really, is the difference? The most straightforward interpretation would most likely be that a remake is a new version of an old thing, a reboot is a different version of an old thing, a revival is a continuation of an old thing, and a spin-off is a new thing that is related to a different thing. Whether or not those definitions check out, CBS is now facing a lawsuit that partially hinges on how one interprets these words.