Source : Webster's Revised Unabridged Dictionary (1913)

Patter \Pat"ter\, n.
   The language or oratory of a street peddler, conjurer, or the
   like, hence, glib talk; a voluble harangue; mere talk;
   chatter; also, specif., rapid speech, esp. as sometimes
   introduced in songs. [Cant or Colloq.]

Patter \Pat"ter\, v. i. [imp. & p. p. {Pattered}; p. pr. & vb.
   n. {Pattering}.] [Freq. of pat to strike gently.]
   1. To strike with a quick succession of slight, sharp sounds;
      as, pattering rain or hail; pattering feet.

            The stealing shower is scarce to patter heard.
                                                  --Thomson.

   2. To mutter; to mumble; as, to patter with the lips.
      --Tyndale. [In this sense, and in the following, perh.
      from paternoster.]

   3. To talk glibly; to chatter; to harangue. [Colloq.]

            I've gone out and pattered to get money. --Mayhew.

Patter \Pat"ter\, v. t.
   1. To spatter; to sprinkle. [R.] ``And patter the water about
      the boat.'' --J. R. Drake.

   2. [See {Patter}, v. i., 2.] To mutter; as prayers.

            [The hooded clouds] patter their doleful prayers.
                                                  --Longfellow.

   {To patter flash}, to talk in thieves' cant. [Slang]

Patter \Pat"ter\, n.
   1. A quick succession of slight sounds; as, the patter of
      rain; the patter of little feet.

   2. Glib and rapid speech; a voluble harangue.

   3. The cant of a class; patois; as, thieves's patter;
      gypsies' patter.

Source : WordNet®

patter
     n 1: plausible glib talk (especially useful to a salesperson)
          [syn: {spiel}, {line of gab}]
     2: a quick succession of light rapid sounds; "the patter of
        mice"; "the patter of tiny feet"

patter
     v 1: rain gently; "It has only sprinkled, but the roads are
          slick" [syn: {sprinkle}, {spit}, {spatter}, {pitter-patter}]
     2: make light, rapid and repeated sounds; "gently pattering
        rain" [syn: {pitter-patter}]