From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]
From WordNet (r) 3.0 (2006) [wn]:
future tense
n 1: a verb tense that expresses actions or states in the future
[syn: future, future tense]