(see also Ethics)

      "Normative science has three widely separated divisions: i. Esthetics; ii. Ethics; iii. Logic.
      Esthetics is the science of ideals, or of that which is objectively admirable without any ulterior reason. I am not well acquainted with this science; but it ought to repose on phenomenology." ('A Syllabus of Certain Topics of Logic', CP 1.191, 1903)

"…it is generally said that the three normative sciences are logic, ethics, and esthetics, being the three doctrines that distinguish good and bad; Logic in regard to representations of truth, Ethics in regard to efforts of will, and Esthetics in objects considered simply in their presentation." (Harvard Lectures on Pragmatism, CP 5.36, 1903)

"…As for esthetics, although the first year of my study of philosophy was devoted to this branch exclusively, yet I have since then so completely neglected it that I do not feel entitled to have any confident opinions about it. I am inclined to think that there is such a Normative Science; but I feel by no means sure even of that.
      Supposing, however, that normative science divides into esthetics, ethics, and logic, then it is easily perceived, from my standpoint, that this division is governed by the three categories. For Normative Science in general being the science of the laws of conformity of things to ends, esthetics considers those things whose ends are to embody qualities of feeling, ethics those things whose ends lie in action, and logic those things whose end is to represent something." (Harvard Lectures on Pragmatism, CP 5.129, 1903)

The concept in question (or a related form) is highlighted with a brown font.
Selected definition-like characterizations are highlighted with a light grey background.
Quotes are presented in reverse chronological order.

Abbreviations (CP, EP, etc.) and sources; see here