Source : Webster's Revised Unabridged Dictionary (1913)

Productive \Pro*duc"tive\, a. [F. productif, L. productivus fit
   for prolongation.]
   1. Having the quality or power of producing; yielding or
      furnishing results; as, productive soil; productive
      enterprises; productive labor, that which increases the
      number or amount of products.

   2. Bringing into being; causing to exist; producing;
      originative; as, an age productive of great men; a spirit
      productive of heroic achievements.

            And kindle with thy own productive fire. --Dryden.

            This is turning nobility into a principle of virtue,
            and making it productive of merit.    --Spectator.

   3. Producing, or able to produce, in large measure; fertile;
      profitable. -- {Pro*duc"tive*ly}, adv. --
      {Pro*duc"tive*ness}, n.

Source : WordNet®

productiveness
     n : the quality of being productive or having the power to
         produce [syn: {productivity}] [ant: {unproductiveness}]