verb (used with object)
to give intellectual or spiritual light to; instruct; impart knowledge to: We hope the results of our research will enlighten our colleagues.
Archaic. to shed light upon.

1350–1400; Middle English enli(g)htenen. See en-1, lighten1

enlightenedly, adverb
enlightenedness, noun
enlightener, noun
enlighteningly, adverb
nonenlightened, adjective
nonenlightening, adjective
preenlighten, verb (used with object)
preenlightener, noun
reenlighten, verb (used with object)
unenlightened, adjective
unenlightening, adjective
well-enlightened, adjective

1. illumine, edify, teach, inform.

1. mystify, confuse, perplex, puzzle.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To enlighten
World English Dictionary
enlighten (ɪnˈlaɪtən)
1.  to give information or understanding to; instruct; edify
2.  to free from ignorance, prejudice, or superstition
3.  to give spiritual or religious revelation to
4.  poetic to shed light on

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c. (O.E. had inlihtan), "to remove the dimness or blindness (usually figurative) from one's eyes or heart," from en- + lighten. Related: Enlightened; enlightening.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It can enlighten, amuse and enrage — sometimes all at once.
Obviously you care enough to enlighten us with your insightful reply.
Movies and music engage and enlighten me, but they don't steal my mind.
The message is that a public education system can enlighten some minds while
  failing to reach others.
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