noun

• The act or result of making something light or lighter.
• (medicine) The sensation caused by the descent of the uterus into the pelvic cavity before the onset of labour
• (nautical) The removal of cargo (especially crude oil) from a vessel in order to reduce its draft
• (obsolete or proscribed) Alternative form of lightning [A flash of light produced by short-duration, high-voltage discharge of electricity within a cloud, between clouds, or between a cloud and the earth.]