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):

satisfactory
    adj 1: giving satisfaction; "satisfactory living conditions";
           "his grades were satisfactory" [ant: unsatisfactory]
    2: meeting requirements; "the step makes a satisfactory seat"
       [syn: satisfactory, acceptable]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "satisfactory":
   OK, absolute, acceptable, adequate, admissible, all right, ample,
   assuring, authoritative, barely sufficient, better than nothing,
   cogent, comfortable, commensurate, competent, conclusive,
   convictional, convincing, corresponding, decent, decisive,
   determinative, due, enough, equal to, fair, fairish, fit, good,
   good enough, goodish, impressive, minimal, minimum, moderate,
   not amiss, not bad, not half bad, not so bad, okay, passable,
   persuasive, plenty, plenty good enough, presentable, pretty good,
   proportionable, proportionate, respectable, satisfying, solid,
   sound, substantial, sufficient, sufficient for, sufficing,
   suitable, telling, tidy, tolerable, unexceptionable, unexceptional,
   unimpeachable, unobjectionable, up to, workmanlike