The Collaborative International Dictionary of English v.0.48:

Restoration \Res`to*ra"tion\ (r?s`t?*r?"sh?n), n. [OE.
   restauracion, F. restauration, fr. L. restauratio. See
   Restore.]
   1. The act of restoring or bringing back to a former place,
      station, or condition; the fact of being restored;
      renewal; reestablishment; as, the restoration of
      friendship between enemies; the restoration of peace after
      war.
      [1913 Webster]

            Behold the different climes agree,
            Rejoicing in thy restoration.         --Dryden.
      [1913 Webster]

   2. The state of being restored; recovery of health, strength,
      etc.; as, restoration from sickness.
      [1913 Webster]

   3. That which is restored or renewed.
      [1913 Webster]

   The restoration (Eng. Hist.), the return of King Charles
      II. in 1660, and the reestablishment of monarchy.

   Universal restoration (Theol.), the final recovery of all
      men from sin and alienation from God to a state of
      happiness; universal salvation.
      [1913 Webster]

   Syn: Recovery; replacement; renewal; renovation;
        redintegration; reinstatement; reestablishment; return;
        revival; restitution; reparation.
        [1913 Webster]

WordNet (r) 3.0 (2006):

Restoration
    n 1: the reign of Charles II in England; 1660-1685
    2: the act of restoring something or someone to a satisfactory
       state
    3: getting something back again; "upon the restitution of the
       book to its rightful owner the child was given a tongue
       lashing" [syn: restitution, return, restoration,
       regaining]
    4: the state of being restored to its former good condition;
       "the inn was a renovation of a Colonial house" [syn:
       renovation, restoration, refurbishment]
    5: some artifact that has been restored or reconstructed; "the
       restoration looked exactly like the original"
    6: a model that represents the landscape of a former geological
       age or that represents and extinct animal etc.
    7: the re-establishment of the British monarchy in 1660

Moby Thesaurus II by Grady Ward, 1.0:

142 Moby Thesaurus words for "restoration":
   Great Leap Forward, about-face, advance, advancement, amelioration,
   amendment, ascent, backing, backsliding, bettering, betterment,
   boost, clearance, clearing, copy, destigmatization, destigmatizing,
   disenchantment, duplication, enhancement, enrichment, eugenics,
   euthenics, exculpation, explanation, extradition, flip-flop,
   fortification, furtherance, giving back, headway, imitation,
   improvement, justification, lapse, lift, melioration, mend,
   mending, palingenesis, pickup, preferment, progress, progression,
   promotion, purgation, purging, ransom, rationalization,
   re-creation, re-formation, rebirth, rebuilding, recapture,
   recidivation, recidivism, reclaiming, reclamation, recommitment,
   reconstitution, reconstruction, reconversion, recoup, recoupment,
   recovery, recuperation, reddition, redemption, redesign, redoing,
   reedition, reestablishment, refashioning, refurbishment,
   regainment, regeneration, regenesis, regress, regression,
   rehabilitation, reinstatement, reinstitution, reissue,
   rejuvenation, relapse, remaking, remand, remandment, remitter,
   renascence, rendition, renewal, renovation, reoccupation,
   reorganization, repair, repatriation, repetition, replevin,
   replevy, repossession, reprinting, reproduction, reshaping,
   restitution, restoring, restructuring, resumption, resurrection,
   retake, retaking, retrieval, retrieve, retrocession,
   retrogradation, retrogression, retroversion, return, returning,
   reversal, reverse, reversion, reverting, revindication, revision,
   revival, revulsion, rise, salvage, sending back, slipping back,
   trover, turn, turnabout, upbeat, uplift, upping, upswing, uptrend,
   upward mobility, vindication, vitaminization