The Collaborative International Dictionary of English v.0.48:

Future \Fu"ture\, n. [Cf. F. futur. See Future, a.]
   [1913 Webster]
   1. Time to come; time subsequent to the present (as, the
      future shall be as the present); collectively, events that
      are to happen in time to come. "Lay the future open."
      --Shak.
      [1913 Webster]

   2. The possibilities of the future; -- used especially of
      prospective success or advancement; as, he had great
      future before him.
      [1913 Webster]

   3. (Gram.) A future tense.
      [1913 Webster]

   To deal in futures, to speculate on the future values of
      merchandise or stocks. [Brokers' cant]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Future \Fu"ture\ (?; 135), a. [F. futur, L. futurus, used as
   fut. p. of esse to be, but from the same root as E. be. See
   Be, v. i.]
   That is to be or come hereafter; that will exist at any time
   after the present; as, the next moment is future, to the
   present.
   [1913 Webster]

   Future tense (Gram.), the tense or modification of a verb
      which expresses a future act or event.
      [1913 Webster]

WordNet (r) 3.0 (2006):

future
    adj 1: yet to be or coming; "some future historian will evaluate
           him" [ant: past, present(a)]
    2: effective in or looking toward the future; "he was preparing
       for future employment opportunities"
    3: (of elected officers) elected but not yet serving; "our next
       president" [syn: future(a), next, succeeding(a)]
    4: a verb tense or other formation referring to events or states
       that have not yet happened; "future auxiliary"
    n 1: the time yet to come [syn: future, hereafter,
         futurity, time to come] [ant: past, past times,
         yesteryear]
    2: a verb tense that expresses actions or states in the future
       [syn: future, future tense]
    3: bulk commodities bought or sold at an agreed price for
       delivery at a specified future date

The Devil's Dictionary (1881-1906):

FUTURE, n.  That period of time in which our affairs prosper, our
friends are true and our happiness is assured.