In this essay I advance major criticisms of recent work on the concept of liberty by, Among others, I berlin, G maccallum, H j mccluskey, S I benn, And f oppenheim. Emerging from these critical analyses is a new definition of 'liberty, In the spirit of negative liberalism', Which differentiates it from the related but distinct goods of human autonomy, Opportunity, Ability, Power, And self-Development.