[ur-goh, er-goh]

conjunction, adverb

Origin of ergo

Borrowed into English from Latin around 1350–1400



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

Origin of ergo-

combining form representing Greek érgon



a combining form of ergot: ergotoxine.

Origin of ergo-

From French

post hoc, ergo propter hoc

[pohst hohk, er-goh prohp-ter hohk; English pohst hok, ur-goh prop-ter hok er-goh]


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]


I think, therefore I am (stated by Descartes as the first principle in resolving universal doubt). Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ergo

Contemporary Examples of ergo

Historical Examples of ergo

  • Ergo, again, ours must infallibly top the markets of the world.

  • There had been an obscure presentiment of 'cognito, ergo sum' more than 2000 years previously.



  • Then he is a father, and he is yours; ergo, he is your father, and the puppies are your brothers.

  • What was I before that instant I suddenly reasoned cogito, ergo sum?

    Cogito, Ergo Sum

    John Foster West

  • She had not spoken to him—ergo, the emotion of encountering him was too great for her.

    In Direst Peril

    David Christie Murray

British Dictionary definitions for ergo



sentence connector

therefore; hence

Word Origin for ergo

C14: from Latin: therefore




informal short for ergometer (def. 2)

cogito, ergo sum

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

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

Medicine definitions for ergo



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Culture definitions for 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 New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.