The Commens Dictionary

Quote from ‘A Brief Intellectual Autobiography by Charles Sanders Peirce’


In phenomenology, [Peirce] is of opinion that there are two sets of categories, a long list and a short one; and he admits that there may possibly be still others. Though he devoted two years to the study of the long list, he attained no satisfactory results. The shorter list is called by [the] easily remembered designation of the cenopythagorean categories. These are Firstness, Secondness, and Thirdness.

Peirce, 1983, p. 72; MS [R] L107:22
Editorial Annotations: 

This quote has been taken from Kenneth Laine Ketner's 1983 reconstruction of Peirce's 'Autobiography'

‘Categories’ (pub. 15.03.18-09:54). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from
Mar 15, 2018, 09:54 by Mats Bergman
Last revised: 
Mar 15, 2018, 13:22 by Mats Bergman