Source : Webster's Revised Unabridged Dictionary (1913)

Ultima \Ul"ti*ma\, a. [L., fem. ultimus last.]
   Most remote; furthest; final; last.

   {Ultima ratio} [L.], the last reason or argument; the last
      resort.

   {Ultima Thule}. [L.] See {Thule}.

Source : WordNet®

ultima Thule
     n : the geographical region believed by ancient geographers to
         be the northernmost land in the inhabited world [syn: {Thule}]