certainstance

This is a stance that you take on something that you are 100% certain on and it will never change. For example: You hating the Red Sox is one of your certainstances.

Terry: I've been thinking about maybe moving in with Millie. I wonder what she'd think?
Barry: I don't know, man. She might, but her parents are very religious. I'm pretty sure that it is their certainstance that you two be married first.
Terry: You're probably right. And we are only in the 3rd grade...