what is love(definition)

From what science has been able to tell us, what we humans often refer to as "love" is, in fact, comprised of a number of different elements.
Frist,Pheromones, one of the basic components of smell, are picked up by receptors in the nose and converted to electrical impulses which tell areas of the brain that "here is someone to whom I could be attracted." "The evidence has now become quite strong that humans produce and detect pheromones," agreed Edward W. Johnson of Idaho State University in Pocatello. However, we should note that other researchers say more study is needed to find out if they are as powerful in humans as they are in other species.
Humans, particularly males, are visually oriented, and sights that please us cause what is known as "pupillary dilation" (your pupils dilate when you see something you like).
 The parasympathetic branch of the autonomic nervous system which mediates sexual arousal, induces such responses as pupillary dilation. When two people look at each other at the same moment, and both sets of pupils dilate, the result is what some people refer to as "love at first sight." We're reacting to the reaction of the other person, as well as to our own reaction to them.
Humans, particularly females, react strongly to the sense of touch. The outer covering of skin is our body's largest "part." Skin makes up about 15% of the body's weight, and occupies some 21 square feet of surface area. Being touched by someone lowers blood pressure, releases endorphins (the brain's equivalent of opium), and causes many other strongly positive reactions. One report of touch deprived women revealed that only a tiny percent had ever had an orgasm.
Taken together, all of these responses lead to sexual attraction, which affects our emotions, which many people translate as "love."
Yet, humans, besides being rather sophisticated members of the animal kingdom, are also rational and rationalizing beings. True, at times our emotions can completely eliminate rational thought, but most people can, with a bit of practice, overrule their emotions and make rational decisions.
Everyone who has been married, or has been in a long-term relationship, has had moments when they were so angry at the other that they began to question whether they truly "loved" the other person anymore. Where were all those feelings they had when the relationship was young? What happened to that pit of the stomach, semi-dizzy, giddy euphoria?
It's at these points when we need to come to the realization that "feelings" are great, but the real test of love is when the pressure's on and everything seems to be going to hell in a hand basket. This is when we need to remember that love is a decision even more than it is a set of feelings. Sometimes we need to call upon our rational natures, overrule our feelings, and decide to love the other.
In a classic "which came first" question, most people would protest that "love should come first," then the mind will follow. What people mean by this is that feelings of being "in love" should come before we decide that we're in love with another person, a kind of "engage feelings before putting mind in gear." Unfortunately this approach doesn't have a very good track record. When we allow our feelings to dictate our reactions to other people, we wind up on an emotional roller coaster, falling in and out of "love" with alarming regularity.
What is love¡ª¡ªHaddaway 

Baby don't hurt me
Don't hurt me
no more
Baby don't hurt me
Don't hurt me
no more
What is love
Yeah
Oh I don't know
why you're not fair
I give you my love
but you don't care
So what is right
and what is wrong
gimme a sign
(chorus x2)
uoh oh...
Oh I don't know
what can I do
what else can I say
it's up to you
I know we're one
just me and you
I can't go on
(chorus x2)
uoh oh..
What is love
What is love
What is love
Baby don't hurt me
Don't hurt me
no more
Don't hurt me
Don't hurt me
I want no other
No other love
This is your life
our time
When we are together
I need you forever
Is it love
(chorus x2)
uoh oh..
(chorus x2)
Baby don't hurt me
Don't hurt me
no more
Baby don't hurt me
Don't hurt me
no more
Baby don't hurt me
Don't hurt me
no more
Baby don't hurt me
Don't hurt me
no more
what is love?!...