lightenv. i.[See Light to alight.] To descend; to light.()O Lord, let thy mercy lighten upon us. (Book of Common Prayer [Eng. Ed.].)v. i.[OE. lightenen. See Light to kindle, illuminate.]1. To burst forth or dart, as lightning; to shine with, or like, lightning; to display a flash or flashes of lightning; to flash.()This dreadful night,
That thunders, lightens, opens graves, and roars
As doth the lion. (Shak.)2. To grow lighter; to become less dark or lowering; to brighten; to clear, as the sky.()v. t.[See Light to illuminate.]1. To make light or clear; to light; to illuminate; as, to lighten an apartment with lamps or gas; to lighten the streets.()A key of fire ran all along the shore,
And lightened all the river with a blaze. (Dryden.)2. To illuminate with knowledge; to enlighten.()Lighten my spirit with one clear heavenly ray. (Sir J. Davies.)3. To emit or disclose in, or as in, lightning; to flash out, like lightning.()His eye . . . lightens forth
Controlling majesty. (Shak.)4. To free from trouble and fill with joy.()They looked unto him, and were lightened. (Ps. xxxiv. 5.)v. t.[See Light not heavy.]1. To make lighter, or less heavy; to reduce in weight; to relieve of part of a load or burden; as, to lighten a ship by unloading; to lighten a load or burden.()2. To make less burdensome or afflictive; to alleviate; as, to lighten the cares of life or the burden of grief.()3. To cheer; to exhilarate.()Lightens my humor with his merry jests. (Shak.)