Carl Smith wrote:
I was thinking of a short word which describes an expression who's evaluation changes depending on the local circumstances. Like a legal bill, not a dollar bill.
Oh. Well, I must say that this was very far from being the first interpretation of the word "bill" that sprang to mind when I saw it.
I wasn't even aware of this meaning of the term "legal bill" (although admittedly I'm not used to living in a country where the laws vary wildly from one place to another).