oncome

noun

1.
the falling to earth of any form of water (rain or snow or hail or sleet or mist)
breefall downsheet onfall downfall precipitation
2.
a sudden occurrence of an uncontrollable condition
coath attack
3.
the act of starting a new operation or practice
inauguration startup
4.
arrival that has been awaited (especially of something momentous)
forecoming the Tocome advent coming