from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Many and varied; of many kinds; multiple: our manifold failings.
  • adj. Having many features or forms: manifold intelligence.
  • adj. Being such for a variety of reasons: a manifold traitor.
  • adj. Consisting of or operating several devices of one kind at the same time.
  • n. A whole composed of diverse elements.
  • n. One of several copies.
  • n. A pipe or chamber having multiple apertures for making connections.
  • n. Mathematics A topological space or surface.
  • transitive v. To make several copies of, as with carbon paper.
  • transitive v. To make manifold; multiply.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A copy made by the manifold writing process.
  • n. A pipe fitting or similar device that connects multiple inputs or outputs.
  • n. The third stomach of a ruminant animal, an omasum.
  • n. A topological space that looks locally like the "ordinary" Euclidean space and is Hausdorff.
  • adj. Various in kind or quality; many in number; numerous; multiplied; complicated; diverse.
  • adj. Exhibited at diverse times or in various ways.
  • adv. Many times; repeatedly.
  • v. To make manifold; multiply.
  • v. To multiply or reproduce impressions of by a single operation.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Various in kind or quality; many in number; numerous; multiplied; complicated.
  • adj. Exhibited at divers times or in various ways; -- used to qualify nouns in the singular number.
  • n. A copy of a writing made by the manifold process.
  • n. A cylindrical pipe fitting, having a number of lateral outlets, for connecting one pipe with several others.
  • n. The third stomach of a ruminant animal.
  • transitive v. To take copies of by the process of manifold writing.

from The Century Dictionary and Cyclopedia

  • Of many kinds; numerous in kind or variety; varied; diverse.
  • Exhibiting or embracing many points, features, or characteristics; complicated in character; having many parts or relations: used with nouns in the singular number: as, the manifold wisdom or the manifold grace of God (Eph. iii. 10; 1 Pet. iv. 10); “the manifold use of friendship,”
  • n. A complicated object or subject; that which consists of many and various parts; specifically, an aggregate of particulars or units; especially, in mathematics, a multitude of objects connected by a system of relations; an ensemble.
  • n. In Kant's theory of knowledge, the total of the particulars furnished by sense before they are connected by the synthesis of the understanding; that which is in the sense and has not yet been in thought.
  • n. A copy or facsimile made by means of a manifold-writer, or by the use of carbon-paper in a type-writer, etc.
  • n. A tube, usually of cast metal, with one or more flanged or screw-threaded inlets and two or more flanged or screw-threaded outlets for pipe-connections, much used in pipe-fitting for steam-heating coils, or for cooling-coils in breweries, and in other cases where it is useful to convey steam, water, or air from a large pipe into several smaller ones. Also called T-branch and header.
  • Many times; in multiplied number or quantity.
  • To make manifold; multiply; specifically, to multiply impressions of by a single operation, as a letter by means of a manifold-writer, or by the use of carbon-paper in a type-writer.
  • n. In mathematics, given a general conception capable of various determinations or determination-modes, the totality of the determinable particulars is a manifold, of which each is an element. The manifold is continuous or discrete, according as the passage from one determination to another is continuous or discrete.
  • n. Same as manifold-valve.
  • n. The third stomach of a ruminant; the manyplies; the intestines generally.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. combine or increase by multiplication
  • v. make multiple copies of
  • n. a pipe that has several lateral outlets to or from other pipes
  • n. a lightweight paper used with carbon paper to make multiple copies
  • adj. many and varied; having many features or forms
  • n. a set of points such as those of a closed surface or an analogue in three or more dimensions


Middle English, from Old English manigfeald : manig, many; see many + -feald, -fald, -fold.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Old English maniġfeald ("manifold, various, varied, complicated, numerous, abundant, plural"), from Proto-Germanic *managaz (“many”) + *-falþaz (“-fold”), equivalent to many +‎ -fold. Cognate with Middle High German manecvalt ("manifold"), Icelandic margfaldr ("multiple"). Compare also German mannigfaltig ("various"), Dutch menigvoudig ("various"), Danish mangfoldig ("diverse"), Swedish mångfaldig ("multiple, manifold, diverse"). (Wiktionary)
From Middle English manifolden, from Old English maniġfealdan ("to multiply, abound, increase, extend, reward"), equivalent to many +‎ -fold. Cognate with Middle High German manecvalten, Icelandic margfalda ("to multiply"), Swedish mångfaldiga ("to manifold, reproduce"). (Wiktionary)


  • Some informal background: a Riemannian manifold is a differentiable manifold (where the tangent space at each point has an inner product) with a positive-definite metric tensor, d (x, y) ≥ 0.

    Bad Language: “Riemannian Manifold”

  • A familiar Riemannian manifold is a Euclidean manifold (where one has to add a smoothly varying inner product on the tangent space of the standard Euclidean space), with the familiar Euclidean (distance) metric (our 3-space, for example).

    Bad Language: “Riemannian Manifold”

  • The Lorentzian manifold is a pseudo-Riemannian manifold, the generalization of the Riemannian manifold, such that the metric tensor need not be positive-definite.

    Bad Language: “Riemannian Manifold”

  • In my sleep I slew them in manifold ways and threw their carcasses into the reservoir.

    The Golden Poppy

  • They are cultural hybrids, to be sure, combining indigenous traditions with Christian theology in manifold ways.


  • Then she took her lute and, preluding thereon in manifold modes, lastly returned to the first and sang these couplets,

    The Book of The Thousand Nights And A Night

  • Each manifold is the virtual manifestation of your own private paradise.

    REVIEW: Lady of Mazes by Karl Schroeder

  • His gutra (not from Dunhill) was tucked in manifold gatherings under the agal, or headband.

    The Backside of War

  • Mixing chambers with a larger volume than just a T-joint pipe provide a longer retention time of air and fuel inside the chamber and a more homogeneous mixture which becomes essential when the distance between mixing device and inlet manifold is short, hence the mixing time.

    5. The Gas Diesel Engine

  • The last alternative may be easier to manufacture but may also show inferior mixing qualities in cases where the distance to the manifold is short.

    6. The Gas Otto Engine


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  • I love how this word can be both academic and automotive.

    September 17, 2007