The Collaborative International Dictionary of English v.0.48:
Lavation \La*va"tion\, n. [L. lavatio: cf. OF. lavation.] A washing or cleansing. [Obs. or R.] [1913 Webster]WordNet (r) 3.0 (2006):
lavation n 1: the work of cleansing (usually with soap and water) [syn: wash, washing, lavation]