Definition of “philosophy” - English Dictionary

“philosophy” in British English

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uk /fɪˈlɒs.ə.fi/ us /fɪˈlɑː.sə.fi/

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 Stoicism

C1 [ 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 Learner's Dictionary & Thesaurus © Cambridge University Press)

“philosophy” in American English

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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.
noun [ C ] us /fɪˈlɑs·ə·fər/

Plato, Aristotle, and the other Greek philosophers
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)