The Enlightenment Movement changed society forever, driving it forward through new and fresh ways of thinking about science, religion, history, politics, and culture. This dictionary offers a balanced overview and helps us to understand and appreciate the Enlightenment through its coverage of the basic assumptions and values that structured the movement; explanation of how these ideas were articulated; the paths of communication they followed; how its key ideas grew, developed and were refracted; and how new problems grew out of what were advanced as solutions to older problems. An engaging introductory essay along with hundreds of cross-referenced dictionary entries defines the significant persons, places, events, institutions, and literary works of the movement. A chronological table charts the progression of the movement by indicating the date, the main figures involved, the political or society events, and the science, arts, or letters that resulted. The comprehensive bibliography, with an introductory essay to the literature, categorized by subject complements this reference that will be valued by all seeking basic details about this important period.