==definition #2 deleted== 

 It did read: "the philosophy developed by early liberals from the Age of Enlightenment until John Stuart Mill from the Age of Enlightenment until John Stuart Mill and then revived in the 20th century by Friedrich Hayek and Milton Friedman" 

 This does not make sense. If I knew nothing about the subject I would think from reading this that Bentham and Mill developed an abstract philosophy which eventually died out only to be revived by Hayek and Friedman.