Origin: 1350–1400; ME
enli(
g)
htenen. See en- 1 , lighten 1 
Related forms: en⋅light⋅ened⋅ly, adverb
en⋅light⋅ened⋅ness, noun
en⋅light⋅en⋅er, noun
en⋅light⋅en⋅ing⋅ly, adverb
Synonyms:
1. illumine, edify, teach, inform.
Antonyms:
1. mystify, confuse, perplex, puzzle.