Preemptive Declaration works, as does Pre Emp Tive Dec Lar A Tion and Preemptive D Eclaration. Since it hasn't got a custom title, these all display differently. I'll submit a request for it in order to keep it standard.

[Note: The above links, except the first one, are done with the {{ }} markup to make them always display that way. Here is a link with the miscapitalisation Khorgar mentioned, done as a wiki word; if the request goes through, it should display normally: Preemptive D Eclaration

Here