The Collaborative International Dictionary of English v.0.48:

Pad \Pad\, v. t. [imp. & p. p. Padded; p. pr. & vb. n.
   Padding.]
   1. To stuff; to furnish with a pad or padding.
      [1913 Webster]

   2. (Calico Printing) To imbue uniformly with a mordant; as,
      to pad cloth. --Ure.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Padding \Pad"ding\, n.
   1. The act or process of making a pad or of inserting
      stuffing.
      [1913 Webster]

   2. The material with which anything is padded.
      [1913 Webster]

   3. Material of inferior value, serving to extend a book,
      essay, etc. --London Sat. Rev.
      [1913 Webster]

   4. (Calico Printing) The uniform impregnation of cloth with a
      mordant.
      [1913 Webster]

WordNet (r) 3.0 (2006):

padding
    n 1: artifact consisting of soft or resilient material used to
         fill or give shape or protect or add comfort [syn:
         padding, cushioning]