philosophy - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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philosophy

noun uk   /fɪˈlɒs.ə.fi/  us   /-ˈlɑː.sə-/
B2 [U] the use of reason in understanding such things as the nature of the real world and existence, the use and limits of knowledge, and the principles of moral judgment: René Descartes is regarded as the founder of modern philosophy.
See also
the philosophy of sth a group of theories and ideas related to the understanding of a particular subject: the philosophy of education/religion/science [C] a particular system of beliefs, values, and principles: the Ancient Greek philosophy of StoicismC1 [C usually singular] informal the way that someone thinks about life and deals with it: Live now, pay later - that's my philosophy of life!
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(Definition of philosophy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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