The quality or state of belonging to a third category or of being a third element, spec. in the philosophy of C. S. Peirce (1839–1914), that…

The action of predesignating or (occasionally) predesigning (something); prior designation, appointment, or specification; an instance of this.

The doctrine that objective account must be taken of the element of chance in (philosophical, cosmological, etc.) reasoning.

Peirce's term for the effect of a proposition, or sign-series, upon its interpreter, the person who understands it; thus, the meaning, in one sense.

Philosophy. (See quot. 1934.) Also transferred.

In the philosophy of C. S. Peirce (1839–1914) and his followers: a quality which, when possessed by a particular object, functions as a word…

In the genitive. Designating the theories, methods, or discoveries of Charles Sanders Peirce; spec. in Peirce's Law n. a logical formula of…