FREE WILL, EXTISTENTIALISM, COMBATIBILISM: Free will is the philosophical aspect of freedom of humans where they have choices that are not determined by prior causes or by divine intervention. Thus 'condemned to be free' and to have a voluntary choice or decision as in 'I do this of my own free will'. Where as existentialism is a chiefly twentieth century philosophical movement embracing diverse doctrines but centring on analysis of individual existence in an unfathomable universe. Therefore the plight of the individual who must assume ultimate responsibility for acts of free will without any certain knowledge of what is right or wrong or good or bad. Compatibilists, by contrast, deny that this much is needed for free will. They hold instead that a person acts freely so long as he is not constrained by external forces, such as the will of another person.