of many kinds; numerous and varied: manifold duties.
having numerous different parts, elements, features, forms, etc.: a manifold program for social reform.
using, functioning with, or operating several similar or identical devices at the same time.
(of paper business forms) made up of a number of sheets interleaved with carbon paper.
being such or so designated for many reasons: a manifold enemy.
something having many different parts or features.
a copy or facsimile, as of something written, such as is made by manifolding.
any thin, inexpensive paper for making carbon copies on a typewriter.
Machinery. a chamber having several outlets through which a liquid or gas is distributed or gathered.
Philosophy. (in Kantian epistemology) the totality of discrete items of experience as presented to the mind; the constituents of a sensory experience.
Mathematics. a topological space that is connected and locally Euclidean. Compare locally Euclidean space.
verb (used with object)
to make copies of, as with carbon paper.

before 1000; Middle English; Old English manigf(e)ald (adj.). See many, -fold

manifoldly, adverb
manifoldness, noun

1. various, multitudinous. See many. 2. varied, divers, multifarious.

1. simple, single. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
manifold (ˈmænɪˌfəʊld)
1.  of several different kinds; multiple: manifold reasons
2.  having many different forms, features, or elements: manifold breeds of dog
3.  something having many varied parts, forms, or features
4.  a copy of a page, book, etc
5.  a chamber or pipe with a number of inlets or outlets used to collect or distribute a fluid. In an internal-combustion engine the inlet manifold carries the vaporized fuel from the carburettor to the inlet ports and the exhaust manifold carries the exhaust gases away
6.  maths
 a.  a collection of objects or a set
 b.  a topological space having specific properties
7.  (in the philosophy of Kant) the totality of the separate elements of sensation which are then organized by the active mind and conceptualized as a perception of an external object
8.  (tr) to duplicate (a page, book, etc)
9.  to make manifold; multiply
[Old English manigfeald. See many, -fold]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. monigfald (Anglian), manigfeald (W.Saxon), "varied in appearance," from manig "many" + -feald "fold." A common Gmc. compound (cf. O.Fris. manichfald, M.Du. menichvout, Swed. mångfalt, Goth. managfalþs), perhaps a loan-translation of L. multiplex (see
multiply). Retains the original pronunciation of many. The noun in the mechanical sense of "pipe or chamber with several outlets" is from 1884; originally as manifold pipe (1857), in ref. to a type of musical instrument mentioned in the O.T.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
manifold   (mān'ə-fōld')  Pronunciation Key 
A topological space or surface.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Stock and filed manifold compared to show size increase.
The problem is various and manifold.
Alexander discovered that the homology groups of the covering manifolds are in
  general different for different knots.
The car used twin carburetors atop a special aluminum manifold.
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