The short answer
Philosophy is a way of thinking about certain subjects such as ethics, thought, existence, time, meaning and value. That 'way of thinking' involves 4 Rs: responsiveness, reflection, reason and re-evaluation. The aim is to deepen understanding. The hope is that by doing philosophy we learn to think better, to act more wisely, and thereby help to improve the quality of all our lives.
The longer one
You can read our longer definition on the document below.
What is Philosophy?