1. [n]  a pipe that has several lateral outlets to or from other pipes
2. [adj]  many and varied; having many features or forms; "manifold reasons"; "our manifold failings"; "manifold intelligence"; "the multiplex opportunities in high technology"
3. [v]  combine or increase by multiplication; "He managed to multiply his profits"
4. [v]  make multiple copies of; "multiply a letter"

Manifold
Following an aborted tenure with NASA, Reid Malenfant, now an extremely wealthy businessman, has developed his own space program. Surrounding himself with the best and brightest scientists that money can hire, he discovers a rift in time that suggests a number of possible timelines into the future. Through this rift, Malenfant and his team may be able to shape the future but, in doing so, could irreparably destroy the past.

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1. \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.
   

2. \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.]
   

3. \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.