Sure. But "fusion" is generally taken as a synonym for "jazz rock fusion", and in the context of Miles is understood to be the funk infected period from the late sixties to mid seventies. And the OP gives that context in any case. I'd argue that "jazz classical fusion" is not really a term that took off. These days Third Stream would be the term used instead. Sketches is a Third Stream album and belongs to Miles' period of collaborating with Gil Evans. By the time of the period this thread is discussing Miles has already been through that era and then through the Second Great Quintet period of "free bop" (or "time no changes") approach to modal improvising. The Fusion period grew out of that era.