Source: "Foundations of the Theory of Signs," 1938, p. 3
“The process in which something functions as a sign may be called semiosis.”
This process, in a tradition which goes back to the Greeks, has commonly been regarded as involving three (or four) factors: that which acts as a sign, that which the sign refers to, and the effect on some interpreter in virtue of which the thing in question is a sign to that interpreter. These three components in semiosis may be called, respectively, the sign vehicle, the designatum, and the interpretant; the interpreter may be included as a fourth factor. These terms make explicit the factors left undesignated in the common statement that a sign refers to something for someone.
Source: "Foundations of the Theory of Signs," 1938, p. 3
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Charles W. Morris 15
American philosopher 1903–1979Related quotes

[I] Signs, 1.13 : Sign and subject
Semiotics and the Philosophy of Language (1984)
Context: !-- The subject is constantly reshaped by the endless resegmentation of the content. In this way (even though the process of resegmentation must be activated by someone, who is probably the collectivity of subjects), the subject is spoken by language (verbal and nonverbal), by the dynamic of sign-functions rather than by the chain of signifiers. --> As subjects, we are what the shape of the world produced by signs makes us become.
Perhaps we are, somewhere, the deep impulse which generates semiosis. And yet we recognize ourselves only as semiosis in progress, signifying systems and communicational processes. The map of semiosis, as defined at a given stage of historical development (with the debris carried over from previous semiosis), tells us who we are and what (or how) we think.

[O] : Introduction, O.I.
Semiotics and the Philosophy of Language (1984)
Context: The sign is usually considered as a correlation between a signifier and a signified (or between expression and content) and therefore as an action between pairs. Semiosis is, according to Peirce, "an action, or influence, which is, or involves, an operation of three subjects, such as a sign, its object, and its interpretant, this tri-relative influence not being in any way resolvable into an action between pairs".
Source: "Foundations of the Theory of Signs," 1938, p. 1 (1971:17), Lead paragraph first chapter

Source: Introduction to semantics, 1962, p. 4

p, 125
Evolution and Ethics (1893)

On The Algebra of Logic (1885)
Context: I call a sign which stands for something merely because it resembles it, an icon. Icons are so completely substituted for their objects as hardly to be distinguished from them. Such are the diagrams of geometry. A diagram, indeed, so far as it has a general signification, is not a pure icon; but in the middle part of our reasonings we forget that abstractness in great measure, and the diagram is for us the very thing. So in contemplating a painting, there is a moment when we lose the consciousness that it is not the thing, the distinction of the real and the copy disappears, and it is for the moment a pure dream, — not any particular existence, and yet not general. At that moment we are contemplating an icon.

Letter to Victoria, Lady Welby (1908) SS 80-81

Source: 1940s-1950s, Public administration, 1950, p. 75