Source : Webster's Revised Unabridged Dictionary (1913)

Concision \Con*ci"sion\, n. [L. concisio: cf. F. concision. See
   {Concise}.]
   A cutting off; a division; a schism; a faction. --South.

Source : WordNet®

concision
     n : terseness and economy in writing and speaking achieved by
         expressing a great deal in just a few words [syn: {conciseness},
          {pithiness}, {succinctness}]