Source : Webster's Revised Unabridged Dictionary (1913)

Plentiful \Plen"ti*ful\, a.
   1. Containing plenty; copious; abundant; ample; as, a
      plentiful harvest; a plentiful supply of water.

   2. Yielding abundance; prolific; fruitful.

            If it be a long winter, it is commonly a more
            plentiful year.                       --Bacon.

   3. Lavish; profuse; prodigal. [Obs.]

            He that is plentiful in expenses will hardly be
            preserved from                        --Bacon.
      -- {Plen"ti*ful*ly}, adv. -- {Plen"ti*ful*ness}, n.

Source : WordNet®

plentiful
     adj 1: existing in great number or quantity; "rhinoceroses were
            once plentiful here"
     2: affording an abundant supply; "had ample food for the
        party"; "copious provisions"; "food is plentiful"; "a
        plenteous grape harvest"; "a rich supply" [syn: {ample}, {copious},
         {plenteous}, {rich}]
     3: producing in abundance; "the bountiful earth"; "a plentiful
        year"; "fruitful soil" [syn: {bountiful}]