Baker, Gordon P. & Hacker, P. M. S. (2005). Wittgenstein: Understanding and Meaning: Volume 1 of an Analytical Commentary on the Philosophical Investigations, Part I: Essays. Malden, MA: Wiley-Blackwell. Edited by P. M. S. Hacker, pp. 159-170, 173-175. Chapter 9. Contextual dicta and contextual principles 1. The problems of a principleThe dictum ‘A word has a meaning only in the context of a sen..