Source : Webster's Revised Unabridged Dictionary (1913)

Tomorrow \To*mor"row\, adv. [Prep. to + morrow.]
   On the day after the present day; on the next day; on the
   morrow.

         Summon him to-morrow to the Tower.       --Shak.

Tomorrow \To*mor"row\, n.
   The day after the present; the morrow.``To-morrow is our
   wedding day.'' -- Cowper.

         One today is worth two to-morrows.       --Franklin.

Source : WordNet®

tomorrow
     n 1: the day after today; "what are our tasks for tomorrow?"
     2: the near future; "tomorrow's world"; "everyone hopes for a
        better tomorrow"
     adv : the next day, the day after, following the present day