WordWeb Online

1. Tending to increase knowledge or dissipate ignorance
   "an illuminating lecture";
   - enlightening, informative

1. Introduce light into
   - light, illume, illumine, light up
    
2. Make free from confusion or ambiguity; make clear
   - clear, clear up, shed light on, crystallize, crystallise [Brit], crystalize, crystalise [Brit], straighten out, sort out, enlighten, elucidate
    
3. (art) add embellishments and paintings to (medieval manuscripts)

Type of: adorn, beautify, clarify, clear up, decorate, elucidate, embellish, grace, lighten, lighten up, ornament

Encyclopedia: Illuminating