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en masse

[ahn mas, en; French ahn mas] /ɑn ˈmæs, ɛn; French ɑ̃ ˈmas/
noun
1.
in a mass; all together; as a group:
The people rushed to the gate en masse.
Origin
1795-1805
1795-1805; < French
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for en masse

en masse

/French ɑ̃ mas/
adverb
1.
in a group, body, or mass; as a whole; all together
Word Origin
C19: from French
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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Contemporary definitions for en masse
adverb

in a mass; all together; as a whole

Word Origin

French

adverb

in general

Word Origin

French

Dictionary.com's 21st Century Lexicon
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Word Origin and History for en masse
en masse
1802, from Fr., lit. "in mass."
Online Etymology Dictionary, © 2010 Douglas Harper
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en masse in Culture
en masse [(ahn mas)]

A French phrase meaning “in a large body”: “The protestors left en masse for the White House.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Idioms and Phrases with en masse
In one group or body; all together. For example, The activists marched en masse to the capitol. This French term, with exactly the same meaning, was adopted into English about 1800.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Difficulty index for en masse

Few English speakers likely know this word

Word Value for en

2
3
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Quotes with en masse