I see the "Gay Marriage" questions showing up again...so what about other forms of marriage..what is marriage?

OK...What do we say the definition of marriage is? Is it the union of one man and one woman? Is it a man/woman, man/man, or woman/woman...all three or none of the above? Is this all a little confusing? It sure is to me. OK so we have this big uproar about s wanting the right to be declared "legally married", what exactly does that mean? Does anybody know of any dictionaries, encyclopedias, or whatever that defines marriage and does it list unions between males and males or unions between females and females? Listen I am not trying to cause trouble. I am just trying to get people to think. What about polygamy? Why aren't people trying to get America to change it's view on polygamy? What is your view on polygamy? Is your head hurting yet?