The best definition of Faiththat I have ever come across is on the image below.
You would have read on hundreds of places about what 'faith' is. Most of them would relate to religious faith. However, this faith is not pertaining to religion but 'LIFE'.
It is all bout your faith in:
* the next moment
* your next step
You see, you don't faith; it is in you. We all have it.
Image courtesy: I got it from one of my Google circles.