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

  • n. Philosophy An indivisible, impenetrable unit of substance viewed as the basic constituent element of physical reality in the metaphysics of Leibniz.
  • n. Biology A single-celled microorganism, especially a flagellate protozoan of the genus Monas.
  • n. Chemistry An atom or a radical with valence 1.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An ultimate atom, or simple, unextended point; something ultimate and indivisible.
  • n. A monoid in the category of endofunctors.

from the GNU version of the Collaborative International Dictionary of English

  • n. An ultimate atom, or simple, unextended point; something ultimate and indivisible.
  • n. The elementary and indestructible units which were conceived of as endowed with the power to produce all the changes they undergo, and thus determine all physical and spiritual phenomena.
  • n. One of the smallest flagellate Infusoria; esp., the species of the genus Monas, and allied genera.
  • n. A simple, minute organism; a primary cell, germ, or plastid.
  • n. An atom or radical whose valence is one, or which can combine with, be replaced by, or exchanged for, one atom of hydrogen.

from The Century Dictionary and Cyclopedia

  • n. In metaphysics, an individual and indivisible substance.
  • n. In biology:
  • n. Any simple single-celled organism.
  • n. In zoology, specifically, a flagellate infusorian; one of the Infusoria flagellata, characterized by the possession of one or two long whip-like flagella, and generally exhibiting an endoplast and a contractile vacuole. The word in this sense is derived from the name of the genus Monas.
  • n. In chem., an element whose atoms have the lowest valence or atomicity, which valence is therefore taken as unity.
  • In chem. and biology, of or pertaining to monads; of the nature of a monad; monadi-form.

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

  • n. (chemistry) an atom having a valence of one
  • n. (biology) a single-celled microorganism (especially a flagellate protozoan)
  • n. a singular metaphysical entity from which material properties are said to derive


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

Latin monas, monad-, unit, from Greek, from monos, single; see men-4 in Indo-European roots.


  • The term monad is, however, generally understood in reference to the philosophy of

    The Catholic Encyclopedia, Volume 10: Mass Music-Newman

  • Since Leibniz 'time the term monad has been used by various philosophers to designate indivisible centres of force, but as a general rule these units are not understood to possess the power of representation or perception, which is the distinguishing characteristic of the Leibnizian monad.

    The Catholic Encyclopedia, Volume 10: Mass Music-Newman

  • Note 127: "According to Capella," Pérez-Gómez notes, "the monad is all that is good, desirable and essential — a notion that was explicitly introduced into Renaissance theology by Nicholas of Cusa in his influential work De docta ignorantia."

    Architecture and Memory: The Renaissance Studioli of Federico da Montefeltro

  • Each monad is made up of 25 cities, each existing within their own sections of 40 floors.

    Robert Silverberg's "The World Inside": Overpopulation, Sex and Sensibility

  • The word monad is used by the neo-Platonists to signify the One; for instance, in the letters of the Christian Platonist Synesius, God is described as the Monad of

    The Catholic Encyclopedia, Volume 10: Mass Music-Newman

  • This second abstraction, "thrown off" by our pure self-consciousness just as the first one is "thrown off" by our pure reason, becomes therefore an intervening monad which exists midway between the monad which is pure "subject" -- if that can be called a monad at all -- and the actual individual soul which is the living reality of both these thought-projections.

    The Complex Vision

  • The monad, which is opposed to the indefinite dyad, is just one of three gods for Numenius (Fr. 11 Des Places), who here follows Moderatus to a degree.


  • Below this first principle are a second one, which is also called the monad, and the indefinite dyad.


  • For in the numbers the infinite in the direction of reduction is not present, as the monad is the smallest; nor is the infinite in the direction of increase, for the parts number only up to the decad.


  • In short, the monad was the keystone of Bruno's all-embracing uni - versal scheme.

    Dictionary of the History of Ideas


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  • He screamed monad! To all. To set the tone and start buisness.

    February 14, 2012

  • 18 listings, but not a single comment. There's some pretty interesting stuff here. Read the Wikipedia entry and discuss.

    March 30, 2009