The Commens Dictionary
Quote from ‘Meaning Preface’
…Real is the proper contrary of Illusion, Delusion, or Figment, while to exist means, by virtue of the ex in exsistere, to act upon, to react against, the other things that exist in the psycho-physical universe.
MS [R] 637:27
‘Existence’ (pub. 07.04.15-13:44). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-meaning-preface-7.