Read the dictionary definition of dawn. All definitions for this word.
1. the earliest period
1. the dawn of civilization
2. the morning of the world
2. the first light of day
1. we got up before dawn
2. they talked until morning
3. an opening time period
1. it was the dawn of the Roman Empire
4. become light
1. It started to dawn, and we had to get up
5. become clear or enter one's consciousness or emotions
1. It dawned on him that she had betrayed him
2. she was penetrated with sorrow
6. appear or develop
1. The age of computers had dawned