Satisfaction
Middle English: from Old French, or from Latin satisfactio(n- ), from satisfacere ‘satisfy, content’ (see satisfy). The earliest recorded use referred to the last part of religious penance after ‘contrition’ and ‘confession’: this involved fulfilment of the observance required by the confessor, in contrast with the current meaning ‘fulfilment of one's own expectations’.
wiktionary
Borrowed from Latin satisfactio, satisfactionis.
etymonline
satisfaction (n.)
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.
