Philosophy is "the study of the fundamental nature of knowledge, reality and existence".
The word 'philosophy ' comes from the Greek φιλοσοφία (philosophia), which means 'love of wisdom.' It is essentially reflective, thinking about how we think, and asks questions about the fundamentals of knowledge and scientific enterprise.
1. "philosophy n." The Concise Oxford English Dictionary, Twelfth edition . Ed. Catherine Soanes and Angus Stevenson. Oxford University Press, 2008. Oxford Reference Online. Oxford University Press. University of South Dakota. 13 August 2012 <http://www.oxfordreference.com/views/ENTRY.html?subview=Main&entry=t23.e42509>
2. "What is philosophy?", The Basics of Philosophy, 13 Aug 2012 <http://www.philosophybasics.com/general_whatis.html>
For philosophy topics that overlap with other disciplines, check out these related LibGuides.