Auf·klä·rung (ouf'klā'rŏŏng) n. The Enlightenment.
[German : auf, up (from Middle High German ūf, from Old High German; see upo in Indo-European roots) + Klärung, a making clear (from klären, to make clear, from Middle High German klæren, from klār, clear, from Latin clārus; see clear).]