That's an especially good one because an "emergent property" is a very specific thing, but people use it to replace "new" (for dramatic effect) and then I have no idea what they're talking about.

I also like "intentionality" which suddenly appears everywhere and means "put thought into." Authors who like that word never seem to specify the content of those thoughts, and therefore delegate all of the hard work of actually having thoughts worth expressing off to other people.