Source : Webster's Revised Unabridged Dictionary (1913)

Modify \Mod"i*fy\, v. t. [imp. & p. p. {Modified}; p. pr. & vb.
   n. {Modifying}.] [F. modifier, L. modificare, modificari;
   modus limit + -ficare (in comp.) to make. See {Mode}, and
   {-fy}.]
   1. To change somewhat the form or qualities of; to alter
      somewhat; as, to modify a contrivance adapted to some
      mechanical purpose; to modify the terms of a contract.

   2. To limit or reduce in extent or degree; to moderate; to
      qualify; to lower.

            Of his grace He modifies his first severe decree.
                                                  --Dryden.