enlightenment has 2 distinct synonyms spread across 2 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unenlightenment.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
education that results in understanding and the spread of knowledge
(Hinduism and Buddhism) the beatitude that transcends the cycle of reincarnation; characterized by the extinction of desire and suffering and individual consciousness
a movement in Europe from about 1650 until 1800 that advocated the use of reason and individualism instead of tradition and established doctrine
“the Enlightenment brought about many humanitarian reforms”
Synonyms, antonyms and the broader and narrower relations for enlightenment come from Princeton University’s WordNet. Full sources and licences.