Source : Webster's Revised Unabridged Dictionary (1913)

Enlighten \En*light"en\, v. t. [Pref. en- + lighten: cf. AS.
   inl[=i]htan. Cf. {Enlight}.]
   1. To supply with light; to illuminate; as, the sun
      enlightens the earth.

            His lightnings enlightened the world. --Ps. xcvii.
                                                  4.

   2. To make clear to the intellect or conscience; to shed the
      light of truth and knowledge upon; to furnish with
      increase of knowledge; to instruct; as, to enlighten the
      mind or understanding.

            The conscience enlightened by the Word and Spirit of
            God.                                  --Trench.

Source : WordNet®

enlighten
     v 1: make understand; "Can you enlighten me--I don't understand
          this proposal" [syn: {edify}]
     2: give spiritual insight to; in religion [syn: {irradiate}]
     3: make free from confusion or ambiguity; make clear; "Could
        you clarify these remarks?"; "Clear up the question of who
        is at fault" [syn: {clear}, {clear up}, {shed light on}, {crystallize},
         {crystallise}, {crystalize}, {crystalise}, {straighten
        out}, {sort out}, {illuminate}, {elucidate}]