Source : Webster's Revised Unabridged Dictionary (1913)

Fold \Fold\, v. t. [imp. & p. p. {Folded}; p. pr. & vb. n.
   {Folding}.] [OE. folden, falden, AS. fealdan; akin to OHG.
   faltan, faldan, G. falten, Icel. falda, Dan. folde, Sw.
   f[*a]lla, Goth. fal?an, cf. Gr.? twofold, Skr. pu?a a fold.
   Cf. {Fauteuil}.]
   1. To lap or lay in plaits or folds; to lay one part over
      another part of; to double; as, to fold cloth; to fold a
      letter.

            As a vesture shalt thou fold them up. --Heb. i. 12.

   2. To double or lay together, as the arms or the hands; as,
      he folds his arms in despair.

   3. To inclose within folds or plaitings; to envelop; to
      infold; to clasp; to embrace.

            A face folded in sorrow.              --J. Webster.

            We will descend and fold him in our arms. --Shak.

   4. To cover or wrap up; to conceal.

            Nor fold my fault in cleanly coined excuses. --Shak.

Folding \Fold"ing\, n.
   1. The act of making a fold or folds; also, a fold; a
      doubling; a plication.

            The lower foldings of the vest.       --Addison.

   2. (Agric.) The keepig of sheep in inclosures on arable land,
      etc.

   {Folding boat}, a portable boat made by stretching canvas,
      etc., over jointed framework, used in campaigning, and by
      tourists, etc. --Ham. Nav. Encyc.

   {Folding chair}, a chair which may be shut up compactly for
      carriage or stowage; a camp chair.

   {Folding door}, one of two or more doors filling a single and
      hung upon hinges.

Source : WordNet®

folding
     n 1: the process whereby a protein molecule assumes its intricate
          three-dimensional shape; "understanding protein folding
          is the next step in deciphering the genetic code" [syn:
          {protein folding}]
     2: the act of folding; "he gave the napkins a double fold"
        [syn: {fold}]

folding
     adj : capable of being folded up and stored; "a foldaway bed"
           [syn: {foldable}, {foldaway}, {folding(a)}]