The Collaborative International Dictionary of English v.0.48:

Rebound \Re*bound"\ (r[-e]*bound"), v. i. [Pref. re- + bound:
   cf. F. rebondir.]
   1. To spring back; to start back; to be sent back or
      reverberated by elastic force on collision with another
      body; as, a rebounding echo.
      [1913 Webster]

            Bodies which are absolutely hard, or so soft as to
            be void of elasticity, will not rebound from one
            another.                              --Sir I.
                                                  Newton.
      [1913 Webster]

   2. To give back an echo. [R.] --T. Warton.
      [1913 Webster]

   3. To bound again or repeatedly, as a horse. --Pope.
      [1913 Webster]

   4. to recover, as from sickness, psychological shock, or
      disappointment.
      [PJC]

   Rebounding lock (Firearms), one in which the hammer
      rebounds to half cock after striking the cap or primer.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rebound \Re*bound"\, v. t.
   To send back; to reverberate.
   [1913 Webster]

         Silenus sung; the vales his voice rebound. --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rebound \Re*bound"\, n.
   1. The act of rebounding; resilience.
      [1913 Webster]

            Flew . . . back, as from a rock, with swift rebound.
                                                  --Dryden.
      [1913 Webster]

   2. recovery, as from sickness, psychological shock, or
      disappointment.
      [PJC]

WordNet (r) 3.0 (2006):

rebound
    n 1: a movement back from an impact [syn: recoil,
         repercussion, rebound, backlash]
    2: a reaction to a crisis or setback or frustration; "he is
       still on the rebound from his wife's death"
    3: the act of securing possession of the rebounding basketball
       after a missed shot
    v 1: spring back; spring away from an impact; "The rubber ball
         bounced"; "These particles do not resile but they unite
         after they collide" [syn: bounce, resile, take a hop,
         spring, bound, rebound, recoil, reverberate,
         ricochet]
    2: return to a former condition; "The jilted lover soon rallied
       and found new friends"; "The stock market rallied" [syn:
       rally, rebound]