"ritual washing," late 14c., from Latin ablutionem (nominative ablutio) "a washing, cleansing," noun of action from past-participle stem of abluere "to wash off, wash away, cleanse by washing," from ab "off, away from" (see ab-) + luere "to wash," from PIE root *leue- "to wash."
-able
able-bodied
ablegation
ableism
abloom
ablution
ABM
Abnaki
abnegate
abnegation
Abner