Optimism definition, a disposition or tendency to look on the more favorable side of events or conditions and to expect the most favorable outcome. See more.
In his works he expressed an optimistic view of freedom. Although Voltaire was the most well known optimist of the Enlightenment, Diderot contributed a crucial factor to the era. Denis Diderot was the son of a craftsman from eastern France. Diderot was an atheist who developed the first encyclopedia. His idea for an all knowledge volume of books proved that he was an important optimist of his.