Source : Webster's Revised Unabridged Dictionary (1913)

Memorable \Mem"o*ra*ble\, a. [L. memorabilis, fr. memorare to
   bring to remembrance, fr. memor mindful, remembering. See
   {Memory}, and cf. {Memorabilia}.]
   Worthy to be remembered; very important or remarkable. --
   {Mem"o*ra*ble*ness}, n. -- {Mem"o*ra*bly}, adv.

         Surviving fame to gain, Buy tombs, by books, by
         memorable deeds.                         --Sir J.
                                                  Davies.

Source : WordNet®

memorable
     adj : worth remembering