late Middle English (in the sense 'leading to the atonement of sin'): from Old French satisfactoire or medieval Latin satisfactorius, from Latin satisfacere 'to content'(see satisfy). The current senses date from the mid 17th century
The adjectives satisfactory and satisfying are closely related (both deriving from the Latin satis ‘enough’ + facere ‘to make’), but there is an important distinction. Satisfactory denotes the meeting or fulfillment of expectations, standards, or requirements: the car’s satisfactory performance in its first three road tests. Satisfying denotes the same, but goes further to connote the pleasure or enjoyment derived from the satisfaction: it was a satisfying one-dish meal.