Learner's definition of PHILOSOPHY
the study of ideas about knowledge, truth, the nature and meaning of life, etc.
— often used before another noun
a particular set of ideas about knowledge, truth, the nature and meaning of life, etc.
— often + of
a set of ideas about how to do something or how to live
Her main cooking philosophy is to use only fresh ingredients.
My philosophy is to live and let live. [=let other people live the way they want to]
His philosophy of life [=his way of living] is to treat people as he would like to be treated.