Dawn (noun)

1. The first appearance of light in the sky before sunrise, also the start of a new day or a new era.
2. The beginning of something, especially a new development or era.

Origin:

Old english dægnes, from dæg "day" + nes "nativity". the verb dates from the mid 16th century.

Examples:

1. The dawn of a new era.
2. The sky was turning pink and gold at dawn.
3. The dawn of the computer age.
4. At dawn, we set out on our journey.
5. Dawn broke, and the sun rose over the horizon.