the GNU version of the Collaborative International Dictionary of English
n. One who enlightens or illuminates; one who, or that which, communicates light to the eye, or clear views to the mind.
The Century Dictionary and Cyclopedia
n. One who illuminates; one who or that which communicates light to the eye or clear views to the mind.
Word Usage
"I know of one educationist (enlightener), who for his love for dark-skinned Africans, gave up prestige and privilege, and came to live and work in Nigeria."