epuration (ep-yuh-RAY-shun) noun
Purification, especially removal of officials or politicians believed to
be disloyal; purge.

Google it, plus "definition," and you'll always get to AWAD, which is where I dig them up. *wink*
For those who want to know:
[From French epuration, epurer, to purify + ation.]
AND:
It contains all vowles, aeiou, once and only once.