Stimulating and authoritative, The Penguin Dictionary of Philosophy is the ideal reference work for anyone with an interest in the subject. Laid out simply for ease of use and put in straightforward language are definitions of terms from akrasia to zetetic. What do philosophers mean by absolute and prime matter? Is there any link between the gambler’s fallacy and the uncertainty principle, or the barber paradox and Ockham’s razor? These questions and many more are answered in this illuminating dictionary.