Is it ensure, insure, or assure?
mid-15c., "capable of atoning for sin," from Middle French satisfactoire (14c.) and directly from Late Latin satisfactorius, from Latin satisfactus, past participle of satisfacere (see satisfy). Meaning "adequate" is from 1630s. Related: Satisfactorily; satisfactoriness.
satisfactory sat·is·fac·to·ry (sāt'ĭs-fāk'tə-rē)
Providing satisfaction sufficient to meet a demand or requirement.