Aufklarung (n.) Look up Aufklarung at Dictionary.com
"the Enlightenment," 1801, from German Aufklärung (18c.), literally "enlightenment," from aufklären "to enlighten" (17c.), from auf "up" (from PIE root *upo "under," also "up from under") + klären "to clear," from Latin clarus (see clear (adj.)).