Source : Webster's Revised Unabridged Dictionary (1913)

Manifold \Man"i*fold\, a. [AS. manigfeald. See {Many}, and
   {Fold}.]
   1. Various in kind or quality; many in number; numerous;
      multiplied; complicated.

            O Lord, how manifold are thy works!   --Ps. civ. 24.

            I know your manifold transgressions.  --Amos v. 12.

   2. Exhibited at divers times or in various ways; -- used to
      qualify nouns in the singular number. ``The manifold
      wisdom of God.'' --Eph. iii. 10. ``The manifold grace of
      God.'' --1 Pet. iv. 10.

   {Manifold writing}, a process or method by which several
      copies, as of a letter, are simultaneously made, sheets of
      coloring paper being infolded with thin sheets of plain
      paper upon which the marks made by a stylus or a
      type-writer are transferred.

Manifold \Man"i*fold\, n.
   1. A copy of a writing made by the manifold process.

   2. (Mech.) A cylindrical pipe fitting, having a number of
      lateral outlets, for connecting one pipe with several
      others.

   3. pl. The third stomach of a ruminant animal. [Local, U.S.]

Manifold \Man"i*fold\, v. t. [imp. & p. p. {Manifolded}; p. pr.
   & vb. n. {Manifolding}.]
   To take copies of by the process of manifold writing; as, to
   manifold a letter.

Source : WordNet®

manifold
     adj : many and varied; having many features or forms; "manifold
           reasons"; "our manifold failings"; "manifold
           intelligence"; "the multiplex opportunities in high
           technology" [syn: {multiplex}]
     n 1: a pipe that has several lateral outlets to or from other
          pipes
     2: a lightweight paper used with carbon paper to make multiple
        copies; "an original and two manifolds" [syn: {manifold
        paper}]
     3: a set of points such as those of a closed surface or and
        analogue in three or more dimensions

manifold
     v 1: make multiple copies of; "multiply a letter"
     2: combine or increase by multiplication; "He managed to
        multiply his profits" [syn: {multiply}]