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[mon-ad, moh-nad] /ˈmɒn æd, ˈmoʊ næd/
  1. any simple, single-celled organism.
  2. any of various small, flagellate, colorless ameboids with one to three flagella, especially of the genus Monas.
Chemistry. an element, atom, or group having a valence of one.
Compare dyad (def 3), triad (def 2a).
  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.
a single unit or entity.
Origin of monad
1605-15; < Late Latin monad- (stem of monas) < Greek (stem of monás): unity. See mon-, -ad1
Related forms
[muh-nad-ik] /məˈnæd ɪk/ (Show IPA),
monadical, monadal, adjective
monadically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for monadically


/ˈmɒnæd; ˈməʊ-/
(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
a single-celled organism, esp a flagellate protozoan
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 monadically



"unity, arithmetical unit," 1610s, from Late Latin monas (genitive monadis), from Greek monas "unit," from monos "alone" (see mono-). In Leibnitz's philosophy, "an ultimate unit of being" (1748). Related: Monadic.

Online Etymology Dictionary, © 2010 Douglas Harper
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monadically in Medicine

monad mo·nad (mō'nād')

  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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