Of or relating to Charles Sanders Peirce (see Peirce, n.), or his theories, methods, or discoveries.

Of, relating to, or characteristic of Bertrand Russell or his work in mathematics and philosophy.

An adherent of Wittgenstein's ideas.

Of, pertaining to, or characteristic of Wittgenstein, or his theories or methods.

Of, relating to, or characteristic of Ryle's theories or his approach to linguistic philosophy or philosophical behaviourism.

Of, relating to, or characteristic of Quine or his theories, esp. on empiricism and the nature of meaning.