What is the philosophical definition of life?
They ask different questions. Philosophy may ask what is life, is there a purpose behind it, etc. Biology asks how does it work, chemistry what are the chemical reactions that drive it, physics maybe how does physics allow for life and how life utilizes and impacts physics, and mathematics how can life and its components be described mathematically.

It is good to remember that all scientific disciplines branched off from philosophy (and religious philosophy) and that they are interconnected.

This is the answer to the part of your question that includes biology. If you want to discuss the meaning of life philosophically, you are welcome to come to do it on the philosophy page!