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monad

[mon-ad, moh-nad] /ˈmɒn æd, ˈmoʊ næd/
noun
1.
Biology.
  1. any simple, single-celled organism.
  2. any of various small, flagellate, colorless ameboids with one to three flagella, especially of the genus Monas.
2.
Chemistry. an element, atom, or group having a valence of one.
Compare dyad (def 3), triad (def 2a).
3.
Philosophy.
  1. (in the metaphysics of Leibniz) an unextended, indivisible, and indestructible entity that is the basic or ultimate constituent of the universe and a microcosm of it.
  2. (in the philosophy of Giordano Bruno) a basic and irreducible metaphysical unit that is spatially and psychically individuated.
  3. any basic metaphysical entity, especially having an autonomous life.
4.
a single unit or entity.
Origin
1605-1615
1605-15; < Late Latin monad- (stem of monas) < Greek (stem of monás): unity. See mon-, -ad1
Related forms
monadic
[muh-nad-ik] /məˈnæd ɪk/ (Show IPA),
monadical, monadal, adjective
monadically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for monadic

monadic

/mɒˈnædɪk/
adjective
1.
being or relating to a monad
2.
(logic, maths) (of an operator, predicate, etc) having only a single argument place

monad

/ˈmɒnæd; ˈməʊ-/
noun
1.
(philosophy) (pl) -ads, -ades (-əˌdiːz)
  1. any fundamental singular metaphysical entity, esp if autonomous
  2. (in the metaphysics of Leibnitz) a simple indestructible nonspatial element regarded as the unit of which reality consists
  3. (in the pantheistic philosophy of Giordano Bruno) a fundamental metaphysical unit that is spatially extended and psychically aware
2.
a single-celled organism, esp a flagellate protozoan
3.
an atom, ion, or radical with a valency of one
Also called (for senses 1, 2) monas
Derived Forms
monadical, adjective
monadically, adverb
Word Origin
C17: from Late Latin monas, from Greek: unit, from monos alone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for monadic
monad
"unity, arithmetical unit," 1615, from L. monas (gen. monadis), from Gk. monas "unit," from monos "alone" (see mono-). In Leibnitz's philosophy, "an ultimate unit of being" (1748).
Online Etymology Dictionary, © 2010 Douglas Harper
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monadic in Medicine

monad mo·nad (mō'nād')
n.

  1. An atom or a radical with a valence of 1.

  2. A single-celled microorganism, especially a protozoan of the genus Monas.

  3. Any of the four chromatids of a tetrad that, after the first and second meiotic divisions, separate to become the chromosomal material in each of the four daughter cells.


mo·nad'ic (mə-nād'ik) or mo·nad'i·cal adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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monadic in Technology


1. unary, when describing an operator or function. The term is part of the dyadic, niladic sequence.
2. See monad.
(1998-07-24)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Article for monadic

monad

(from Greek monas "unit"), an elementary individual substance that reflects the order of the world and from which material properties are derived. The term was first used by the Pythagoreans as the name of the beginning number of a series, from which all following numbers derived. Giordano Bruno in De monade, numero et figura liber (1591; "On the Monad, Number, and Figure") described three fundamental types: God, souls, and atoms. The idea of monads was popularized by Gottfried Wilhelm Leibniz in Monadologia (1714). In Leibniz's system of metaphysics, monads are basic substances that make up the universe but lack spatial extension and hence are immaterial. Each monad is a unique, indestructible, dynamic, soullike entity whose properties are a function of its perceptions and appetites. Monads have no true causal relation with other monads, but all are perfectly synchronized with each other by God in a preestablished harmony. The objects of the material world are simply appearances of collections of monads.

Learn more about monad with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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