Definition of life is subjective. Everyone has to define life in their own way by living. As for me, life is a gift that I have been granted by God. This world's life is temporary, I will die one day and before I die, I must define what life is to me.
We don't know when we will die, what will happen after life and so we live only by God's grace. Therefore we should strive to live our life through ways that please God. This ways include generosity, kindness, compassion and love. This way we will be defining life through what we do everyday.