Throughout the world, Adolf Hitler, Ron Paul, Rick Santorum, etc. are all classified as extreme-right, even though there are a lot of differences between the them. Perhaps a valid definition that applies to all political situations throughout the world can be created by finding what all of the people classified as "right wing" (or left) throughout the world have in common?
What the right-wing has in common for the most part is opposition to the left - the left being ideas about progress in creating a new order based on equality and being unshackled by tradition. The complication comes from the fact that in the postWW2 era the right sometimes ends up seeking to change governments and cultural institutions away from a program that was left-wing to some degree but is now status quo.