The word(s) "enlightenment" appears 2 time(s) in 2 verse(s) in Quran in Mohsin Khan translation.

(1) Then if they reject you (O Muhammad صلى الله عليه وسلم), so were Messengers rejected before you, who came with Al-Bayyinat (clear signs, proofs, evidence) and the Scripture and the Book of enlightenment.

(2) And indeed We gave Musa (Moses) - after We had destroyed the generations of old -the Scripture [the Taurat (Torah)] as an enlightenment for mankind, and a guidance and a mercy, that they might remember (or receive admonition).