philosophy Definition in Cambridge American English Dictionary
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Definition of "philosophy" - American English Dictionary

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philosophynoun [C/U]

 us   /fɪˈlɑs·ə·fi/
the study of the nature of reality and existence, of what it is possible to know, and of right and wrong behavior, or a particular set of beliefs of this type: [C] the philosophy of Kant [U] I’d like to take a course in philosophy next semester. The philosophy of a subject is a group of theories and ideas related to the understanding of that subject: [U] the philosophy of language/science A philosophy is also the beliefs you have about how you should behave in particular situations in life: [C] It was always my philosophy to pay my debts promptly.
philosopher
noun [C]  us   /fɪˈlɑs·ə·fər/
Plato, Aristotle, and the other Greek philosophers
philosophize
verb [I]  us   /fɪˈlɑs·əˌfɑɪz/
That’s when she’ll start philosophizing about the notion of time.
(Definition of philosophy from the Cambridge Academic Content Dictionary © Cambridge University Press)
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