I don't agree with many of the definitions here, butterflies and all that, because love isn't something you only feel for a signifacant other, it's something you feel for family and friends, and sometimes even strangers you meet in passing.

"Love is a many spledored thing, love lifts us up where we belong, love gives us wings, all you need is love!"

True. But love is also putting yourself through hell, pain, and anguish if necessary to keep the one you love from enduring the same. It's protection when they need it, and selflessness when they don't expect it. Mostly, I think love is overcoming all obsticals, physical, finacial, and emotional, as a union rather than an individual acting for their own good.