Thanks all for your responses. My thoughts:
Imaculada Thanks for the definition, it always helps! Yes the dictionary definitions you give seem something like my understanding of patriarchy as a 'system of system of society or government' (i.e. with some kind of rules, formality and people in charge) - i.e. something more like Saudi Arabia. I guess this is what I was trying to get at - I am sure 'conspiracy' was the wrong word to use though!
Your own definition around cultural beliefs and prejudices seems to disagree with the 'official' definitions and be more akin to something like 'institutional racism' (unthinking discrimination, racist language etc..). This certainly exists, but not what I think of when I hear 'The Patriarchy'
HerBEX Your description of the patriarchy is of a social construct 'the norm'?
But it seems that many of the drivers underlying socially constructed gender roles are biological in origin (i.e. the costs and benefits to evolutionary fitness for a man or a woman to sacrifice other opportunities in order to raise a child are shaped by the fact that when a woman is pregnant she can't get pregnant again, whereas a man can have as many children in a year as he can afford/get away with. Hidden ovulation woman can be 100% that the child is hers and has a better idea than the man if there is a chance that it isn't his). Does thinking about gender relations in terms of 'the patriarchy' discount these kinds of explanations (not justifications..!) and why?
I agree it is the norm for men to dominate power, but the fact that this occurs everywhere (?) from Tibet, to Peru to Aborigine and Native American societies is a sign that it is not just a social construct?
To me it seems like it is the norm in the same way that poverty has been the norm for most people over the vast sweep of human history and still today, and it is only the modern inventions of science, technology, democracy that have changed that.
In terms of comparing race, class and gender effects it doesn't necessarily make sense to compare a rich black man and a rich black woman, a poor black man and poor black woman. More to the point is to compare how they got there, i.e. comparing children born in relatively similar circumstances and where they end up in life. A rich black man may be better off than a rich black woman, but if out of a 100 boys, 10 end up dead and 30 in prison and 40 on the poverty line, then you are looking in the wrong place for answers.
I guess the big difference between 'patriarchy' as an explanation for discrimination and abuse and racisim, nazism, apartheid, class discrimination is that it is possible to have completely divided societies where people and families are on one side or the other and defend their own interests though some form of in-group/out-group thing or basic nepotism. With gender it is not like that - everyone has a mother and father etc... structures of the elite will tend to favour members of the elite, rather than others of a common gender. MRIC - it is not usually marriage that gets women elite status it is birth.