noun. The act or fact of becoming or making light or less heavy.

noun. A becoming light; the break of day. See lightning, 1.

noun. See lightning, 2.

noun. A brightening up, as of the mind or spirit.

noun. In metallurgy, the sudden brightening of the color of silver during cupellation when the metal reaches the point of greatest purity.

noun. The process of changing to a lighter color.

verb. Present participle of lighten.

noun. The sensation caused by the descent of the uterus into the pelvic cavity before the onset of labour

noun. The removal of cargo (especially crude oil) from a vessel in order to reduce its draft

noun. changing to a lighter color

noun. descent of the uterus into the pelvic cavity that occurs late in pregnancy; the fetus is said to have dropped

"Begin lightening raids on predatory businesses and apprehending all illegal immigrants in the workplace."

descent  

brightening  enlightening  frightening  heightening  tightening  

abatement  achromatization  allayment  alleviating  alleviation  

lighten