The Collaborative International Dictionary of English v.0.48:

Satisfactory \Sat`is*fac"to*ry\, a. [Cf. F. satisfactoire.]
   1. Giving or producing satisfaction; yielding content;
      especially, relieving the mind from doubt or uncertainty,
      and enabling it to rest with confidence; sufficient; as, a
      satisfactory account or explanation.
      [1913 Webster]

   2. Making amends, indemnification, or recompense; causing to
      cease from claims and to rest content; compensating;
      atoning; as, to make satisfactory compensation, or a
      satisfactory apology.
      [1913 Webster]

            A most wise and sufficient means of redemption and
            salvation, by the satisfactory and meritorious death
            and obedience of the incarnate Son of God, Jesus
            Christ.                               --Bp.
                                                  Sanderson.
      [1913 Webster] -- Sat`is*fac"to*ri*ly, adv. --
      Sat`is*fac"to*ri*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

satisfactoriness
    n 1: the quality of giving satisfaction sufficient to meet a
         demand or requirement [ant: unsatisfactoriness]