Source : Webster's Revised Unabridged Dictionary (1913)

Plenteous \Plen"te*ous\, a. [From {Plenty}.]
   1. Containing plenty; abundant; copious; plentiful;
      sufficient for every purpose; as, a plenteous supply.
      ``Reaping plenteous crop.'' --Milton.

   2. Yielding abundance; productive; fruitful. ``The seven
      plenteous years.'' --Gen. xli. 34.

   3. Having plenty; abounding; rich.

            The Lord shall make thee plenteous in goods. --Deut.
                                                  xxviii. 11.

   Syn: Plentiful; copious; full. {See Ample}. --
        {Plen"te*ous*ly}, adv. -- {Plen"te*ous*ness}, n.

Source : WordNet®

plenteousness
     n : a full supply; "there was plenty of food for everyone" [syn:
          {plenty}, {plentifulness}, {plenitude}, {plentitude}]