The problem with what you're trying to put forward here is that you think this is an interpretation. It's not. A 0-day has a very strict definition.
You can't just choose random words or expressions you don't understand without looking them up and decide they mean something else because you thought they did. Otherwise, the annals of medicine would look very different.
"An attack on a software flaw that occurs before the software's developers have had time to develop a patch for the flaw is often known as a zero-day exploit."
http://www.tomsguide.com/us/zero-day-exploit-definition,news...
The meaning of a word or term today may not be the same tomorrow, languages evolve with the way people communicate, not with the way they get defined.
0-day is a good example, because people outside the security field only care about whether they're vulnerable or not, not about the intricacies of the term.