The Bible defines love. God is love. If it is not of God, it is not love. As Aineo stated, love -- for humans -- is an action verb, not a state of being.
For God so LOVED the world (and the Bible also says how disgusted He is with parts of it!) that He gave His only begotten Son....
Describing the effects of love does not define love. The closest we can come is to say that love is commitment over and above one's care for oneself.
But love is what we were created for. Not Valentine's cards, not even hugs. But the sort of commitment the Schindlers had for Terri, where they exhausted everything they had to try to protect her from starvation and dehydration.