Charles Sanders Peirce

Charles Sanders Peirce (1839–1914) was an American philosopher, logician, and mathematician who founded semiotics as a formal discipline and made foundational contributions to logic, philosophy of science, and pragmatism. Peirce is arguably the most original American philosopher, and among the least read — his work remained largely unpublished during his lifetime, and the full scope of his semiotic theory is still being assimilated.

Peirce's most distinctive contribution is his triadic theory of signs: every meaningful sign involves three irreducibly related elements — the representamen (the sign vehicle), the object (what it refers to), and the interpretant (the sign's meaning in a mind). This triad resists reduction: dyadic theories of signification, like Saussure's signifier/signified, lose the interpreting mind; theories that focus only on the object lose the sign's mediated character. Peirce held that meaning is always a process — semiosis — in which signs produce further signs, in an infinite but structured chain.

His pragmatic maxim states that the meaning of a concept is exhausted by the practical difference it makes to possible experience. This connects his semiotic theory to empiricism while avoiding its naive form: meanings are not images or sensations, but patterns of expected consequence. The maxim is a philosophy of language and a theory of scientific method simultaneously — an idea that would later influence Ludwig Wittgenstein and Wilfrid Sellars along very different paths.