[ 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


mo·nad·ic [muh-nad-ik] /məˈnæd ɪk/, mo·nad·i·cal, mo·nad·al, adjectivemo·nad·i·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for monadically

/ (ˈmɒnæd, ˈməʊ-) /


plural -ads or -ades (-əˌdiːz) philosophy
  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 of monad

monadical, adjectivemonadically, adverb

Word Origin for monad

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

Medical definitions for monadically

[ mōnăd′ ]


An atom or a radical with a valence of 1.
A single-celled microorganism, especially a protozoan of the genus Monas.
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.

Other words from monad

mo•nadic (mə-nădik) null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.