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 tense
    n 1: a verb tense that expresses actions or states in the future
         [syn: future, future tense]