Lightened meaning : To make brighter or clearer; to illuminate. To become brighter or clearer; to brighten. To burst forth or dart, as lightning; to shine with, or like, lightning; to flash. To emit or disclose in, or as if in, lightning; to flash out, like lightning. To illuminate with knowledge; to enlighten. To alleviate; to reduce the burden of. To make light or lighter in weight. To make less serious or more cheerful. To become light or lighter in weight. To become less serious or more cheerful. To descend; to light.