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1. Philosophy An indivisible, impenetrable unit of substance viewed as the basic constituent element of physical reality in the metaphysics of Leibniz.
2. Biology A single-celled microorganism, especially a flagellate protozoan formerly classified in the taxonomic group Monadina.

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

mo·nad′ic (mə-năd′ĭk), mo·nad′i·cal adj.
mo·nad′i·cal·ly adv.
mo′nad·ism n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈmɒnəˌdɪzəm; ˈməʊ-) or


(Philosophy) (esp in the writings of Leibnitz) the philosophical doctrine that monads are the ultimate units of reality
ˌmonadˈistic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


1. the Leibnizian doctrine of monads as unextended, indivisible, and indestructible entities that are the ultimate constituent of the universe and a microcosm of it. Also called monadology.
2. the doctrine of Giordano Bruno concerning monads as basic and irreducible metaphysical units that are psychically and spatially individuated. — monadistic, adj.
See also: Philosophy
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
These assumptions of monadism, dyadism, and communalism represent worldview-level concepts that may explain relational behavior, but which have received little attention in the literature.
Eliot, 'Tire Development of Leibniz's Monadism', The Monist, 26.
Yet, in that it differentiates a particular form of unity from those types characteristic of monism, monadism, chemical integration, or mechanical solidarity, it presents a certain viability even given its analogical limitations.