The story
- Latin · derived frompūrgātiō
- Anglo-Norman · derived frompurgacion
- Middle English · inherited frompurgacioun
- English todaypurgation
From Middle English purgacioun, borrowed from Anglo-Norman purgacion, itself borrowed from Latin pūrgātiō; equivalent to purge + -ation.
Etymology from Wiktionary, CC BY-SA 4.0.