What it means

1. noun the earliest period
   “the dawn of civilization”
2. noun the first light of day
   “we got up before dawn”
3. noun an opening time period
   “it was the dawn of the Roman Empire”
4. verb become light
   “It started to dawn, and we had to get up”
5. verb appear or develop
   “The age of computers had dawned”
6. verb become clear or enter one's consciousness or emotions
   “It dawned on him that she had betrayed him”