Hey there!
The root word in Enlightenment is Enlighten.
To enlighten someone, is to help them understand, about a specific subject or point of view.
For example, when you hear someone say "Enlighten me", they may mean something along the lines of "explain it to me".
This phrase is often used when someone is confused, or does not understand a specific subject, or aspect.
Hope this helps!
~Autumly