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