/
ɪˈl(j)uːmɪneɪt/
v.
   - light up.
- 
[usu. as adj. illuminating]
 help to clarify or explain.
- 
[often as adj. illuminated]
 decorate (a page or initial letter in a manuscript) with gold, silver, or coloured designs.
Derivative
- illuminatingly adv.
- illuminative adj.
- illuminator n.
Etymology
ME: from L. illuminat-, illuminare ‘illuminate’, from in- ‘upon’ + lumen, lumin- ‘light’.