What's the "een" in Halloween?
early 14c., "performance of an act set forth by a priest or other Church authority to atone for sin," from Old French satisfaction (12c.), from Latin satisfactionem (nominative satisfactio) "a satisfying of a creditor," noun of action from past participle stem of satisfacere (see satisfy). Senses of "contentment, appeasement" and "action of gratifying" first recorded late 14c.; the former not common before 16c.
satisfaction sat·is·fac·tion (sāt'ĭs-fāk'shən)
The fulfillment or gratification of a desire, a need, or an appetite.
The pleasure or contentment that is derived from such gratification.