WordWeb Online

1. Tending to increase knowledge or dissipate ignorance
   "an enlightening glimpse of government in action"
   - informative, illuminating
    
2. Enlightening or uplifting so as to encourage intellectual or moral improvement
   - edifying

1. Make understand
   "Can you enlighten me--I don't understand this proposal"
   - edify
    
2. Give spiritual insight to; in religion
   - irradiate
    
3. Make free from confusion or ambiguity; make clear
   - clear, clear up, shed light on, crystallize, crystallise [Brit], crystalize, crystalise [Brit], straighten out, sort out, illuminate, elucidate

See also: enlightenment

Type of: clarify, clear up, elucidate, instruct, learn, prophesy, teach, vaticinate

Antonym: unenlightening