I don't think there's one way to define it. Keep in mind there are a few different types of love as well. I love many of my friends very deeply, just as much as I love my family. Can I describe those feelings? Not sure, but I care very much about them.

Love, as in how I loved my wife is another story. I don't think I could describe that all. There wasn't a thing in the world I wouldn't do for her. She was my life, I was her life. And that developed over the course of a 10 year relationship. It was something that (I thought) was unbreakable. I think the bible gives the best definition of love though. True love is all of those things.