Contents -- Notes on Contributors -- 1. Introduction -- 2. Frege on Apriority -- 3. Rationalism, Empiricism, and the A Priori -- 4. A Priori Knowledge Revisited -- 5. Naturalism and the A Priori -- 6. Apriority as an Evaluative Notion -- 7. Stipulation, Meaning, and Apriority -- 8. A Priori Rules: Wittgenstein on the Normativity of Logic -- 9. Apriority and Existence -- 10. Knowlege of Logic -- 11. Explaining the A Priori: The Programme of Moderate Rationalism -- 12. Implicit Definition and the A Priori -- 13. Representation, Scepticism, and the A Priori -- 14. The Status of Logic -- 15. Transcendental Philosophy and A Priori Knowledge: A Neo-Kantian Perspective -- 16. Externalism and Armchair Knowledge -- 17. Externalism and A Priori Knowledge of Empirical Facts -- 18. The Psychophysical Nexus -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- Y.