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A posteriori  -  An a posteriori truth is a truth that is arrived at by observing the world. An a posteriori argument involves gathering evidence from experience and reasoning from that evidence. For example, the fact that John has blonde hair would be a truth that we can know based on a posteriori reasoning. The fact that heat is molecular motion would be another such fact. Many philosophers claim that all substantive facts about the world are a posteriori, and that all arguments for substantive facts must be a posteriori arguments.



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a posteriori puzzle;

http://209.85.129.104/search?q=cache:Qa9FWPLunyQJ:contextes.free.fr/ch11.pdf+a+posteriori+puzzles&hl=en&gl=uk&ct=clnk&cd=19


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Interesting short glossary


http://www.philosophypages.com/dy/a5.htm