Source : Webster's Revised Unabridged Dictionary (1913)

Terminable \Ter"mi*na*ble\ (-m[i^]n*[.a]*b'l), a. [See
   {Terminate}.]
   Capable of being terminated or bounded; limitable. --
   {Ter"mi*na*ble*ness}, n.

   {Terminable annuity}, an annuity for a stated, definite
      number of years; -- distinguished from {life annuity}, and
      {perpetual annuity}.

Source : WordNet®

terminable
     adj : possible to terminate or terminating after a designated
           time; "terminable employees"; "a terminable annuity"