Google seems to imply the latter; I've found a so called technical dictionary website that has a vague definition, and a few instances of it that were either typos or similarly vague...
Both the type moon wiki and the in-game text use "Interation", even though they don't agree on certain terminology, which leads me to believe it may be a real term..
Alternatively, I'm starting to think it might be some kind of Fnord.
It's alright, we feel your pain. Noone wants to admit being gar for Berserker.