1. Love and pursuit of wisdom by intellectual means and moral self-discipline.
2. Investigation of the nature, causes, or principles of reality, knowledge, or values, based on logical reasoning rather than empirical methods.
3. A system of thought based on or involving such inquiry: the philosophy of Hume.
4. The critical analysis of fundamental assumptions or beliefs.
5. The disciplines presented in university curriculums of science and the liberal arts, except medicine, law, and theology.
6. The discipline comprising logic, ethics, aesthetics, metaphysics, and epistemology.
7. A set of ideas or beliefs relating to a particular field or activity; an underlying theory: an original philosophy of advertising.
8. A system of values by which one lives: has an unusual philosophy of life.

[Middle English philosophie, from Old French, from Latin philosophia, from Greek philosophiā, from philosophos, lover of wisdom, philosopher. See philosopher.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.