What defines "left-wing" and "right-wing"?

I personally agree with Wikipedia's general definitions

Quote:

Left-wing politics are political positions or activities that accept or support social equality, often in opposition to social hierarchy and social inequality.[1][2][3][4] They typically involve concern for those in society who are perceived as disadvantaged relative to others and a belief that there are unjustified inequalities that need to be reduced or abolished.[3]

Quote:

Right-wing politics are political positions or activities that view some forms of social stratification or social inequality as either inevitable, natural, normal, or desirable,[1][2][3] typically defending this position on the basis of natural law, economics or tradition.[4][5][6][7][8][9] Hierarchy and inequality may be viewed as natural results of traditional social differences[10] and/or from competition in market economies.[11][12]

via International Skeptics Forum http://ift.tt/1NJ4emL