I was always under the impression that 'FMV' refers to any cutscene that is played out from the game CD/DVD as a linear movie file - so the (live action) cutscenes in Wing Commander 4 qualify, the pre-generated cutscenes in Curse of Monkey Island and Grim Fandango qualify, but things like the 'pirate song' in COMI or the cutscenes in Ocarina of Time (both done entirely through the game engine) aren't FMV.
My logic for this is that the term 'FMV' didn't seem to exist until CD-ROM based systems came along. And if you wanted 'FMV' on your Amiga CD-32, you had to get some kind of 'FMV Adaptor', which was just an MPEG decoder card. As you say, maybe the definition has changed over the years, but I think that this is what it meant originally. And agreed - it's the sort of meaningless jargon we can do without nowadays.
