|1.||to become or make light|
|2.||(intr) to shine; glow|
|3.||(intr) (of lightning) to flash|
|4.||(tr) an archaic word for enlighten|
lightening light·en·ing (līt'n-ĭng)
The sensation of decreased abdominal distention during the latter weeks of pregnancy following the descent of the fetal head into the pelvic inlet.