dawn

Become clear or enter one's consciousness or emotions.

“It dawned on him that she had betrayed him”

Appear or develop.

“The age of computers had dawned”

Become light.

“It started to dawn, and we had to get up”

The first light of day.

“we got up before dawn”

The earliest period.

“the dawn of civilization”

An opening time period.

“it was the dawn of the Roman Empire”