noun (n)

• a belief (or system of beliefs) accepted as authoritative by some group or school(noun.cognition)

  Synonym:
  doctrine, ism, philosophical system, school of thought
  

  source: wordnet30
• the rational investigation of questions about existence and knowledge and ethics(noun.cognition)

  source: wordnet30
• any personal belief about how to live or how to deal with a situation(noun.cognition)

  Example:
  Self-indulgence was his only philosophy.
  My father's philosophy of child-rearing was to let mother do it.
  

  source: wordnet30
• Literally, the love of, including the search after, wisdom; in actual usage, the knowledge of phenomena as explained by, and resolved into, causes and reasons, powers and laws.(noun)

  source: webster1913