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n. pl. met·a·gal·ax·ies
The assemblage of all galaxies; the entire physical universe.
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.


n, pl -axies
(Astronomy) the total system of galaxies and intergalactic space making up the universe
metagalactic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌmɛt əˈgæl ək si)

n., pl. -ax•ies.
the complete system of galaxies.
met`a•ga•lac′tic (-gəˈlæk tɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


the entire system of galaxies, including the Milky Way. — metagalactic, adj.
See also: Astronomy
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
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