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[ur-goh, er-goh] /ˈɜr goʊ, ˈɛr goʊ/
conjunction, adverb
Origin of ergo
1350-1400; < Latin


a combining form meaning “work”:
Also, especially before a vowel, erg-.
combining form representing Greek érgon


a combining form of ergot:
< French

post hoc, ergo propter hoc

[pohst hohk, er-goh prohp-ter hohk; English pohst hok, ur-goh prop-ter hok er-goh] /ˈpoʊst ˈhoʊk, ˈɛr goʊ ˈproʊp tɛr ˌhoʊk; English ˈpoʊst ˈhɒk, ˈɜr goʊ ˈprɒp tər ˌhɒk ˈɛr goʊ/
after this, therefore because of it: a formula designating an error in logic that accepts as a cause something that merely occurred earlier in time.

cogito, ergo sum

[koh-gi-toh er-goh soo m; English koj-i-toh ur-goh suhm, er-goh] /ˈkoʊ gɪˌtoʊ ˈɛr goʊ ˈsʊm; English ˈkɒdʒ ɪˌtoʊ ˈɜr goʊ ˈsʌm, ˈɛr goʊ/
I think, therefore I am (stated by Descartes as the first principle in resolving universal doubt). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for ergo
Contemporary Examples
Historical Examples
  • ergo, he had been her lover, whom she wished to be rid of—why?

    I Will Repay Baroness Emmuska Orczy
  • ergo, I never give in Church unless I have half a sovereign in my pocket.

    Happy-Thought Hall F. C. Burnand
  • The truth is sum, ergo cogito—I am, therefore I think, although not everything that is thinks.

    Tragic Sense Of Life Miguel de Unamuno
  • ergo—they cannot possibly feel the same pain as the more perfect.

    Olla Podrida Frederick Marryat (AKA Captain Marryat)
  • ergo, (I have reached the conclusion at last,) I did not mean to flatter you.

British Dictionary definitions for ergo


sentence connector
therefore; hence
Word Origin
C14: from Latin: therefore


(informal) short for ergometer (sense 2)

cogito, ergo sum

/ˈkɒɡɪˌtəʊ ˈɜːɡəʊ ˈsʊm/
I think, therefore I am; the basis of Descartes' philosophy
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 ergo

c.1400, from Latin ergo "therefore, in consequence of," possibly from *ex rogo "from the direction," from ex "out of" (see ex-) + root of regere "to guide" (see regal).

Online Etymology Dictionary, © 2010 Douglas Harper
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ergo in Medicine

ergo- pref.
Work: ergometer.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ergo in Culture
ergo [(er-goh, ur-goh)]

Latin word meaning “therefore”; usually used to show a logical conclusion: “Birds are warm-blooded animals, and reptiles are cold-blooded animals; ergo, no bird is a reptile.”

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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Related Abbreviations for ergo


Euthanasia Research and Guidance Organization
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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