Definitions
1.verbTo make brighter or clearer; to illuminate."to lighten an apartment with lamps or gas; to lighten the streets"
2.verbTo become brighter or clearer; to brighten.
3.verbTo burst forth or dart, as lightning; to shine with, or like, lightning; to flash.
4.verbTo emit or disclose in, or as if in, lightning; to flash out, like lightning.
5.verbTo illuminate with knowledge; to enlighten.