Here is some definitions of Love...

True love is eternal and unconditional, not something you can turn on and off as you so desire.
Love is having to say you're sorry every five minutes. -- JohnLennon
Interdependence of process.
Taking pleasure from the happiness of another.
There are more kinds of love than there are people. Unfortunately, though, there are fewer kinds of love than the number of people, squared.
"Love is that condition in which the happiness of another person is essential to your own." -- RobertHeinlein