Published on *Commens* (http://www.commens.org)

Teridentity

1903 | A Syllabus of Certain Topics of Logic | Peirce, 1903, p. 18; CP 4.406

…a point upon which three lines of identity abut is a graph expressing the relation of *teridentity*.

1906 | Prolegomena to an Apology for Pragmaticism | CP 4.561

…the concept of teridentity is not mere identity. It is identity *and* identity, but this “and” is a distinct concept, and is precisely that of teridentity.