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cogito, ergo sum

[koh-gi-toh er-goh soo m; English koj-i-toh ur-goh suhm, er-goh]
Latin.
  1. I think, therefore I am (stated by Descartes as the first principle in resolving universal doubt).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for cogito, ergo sum

cogito, ergo sum

  1. I think, therefore I am; the basis of Descartes' philosophy
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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