I. ˈdȯn, ˈdän intransitive verb
Etymology: Middle English, probably back-formation from dawning daybreak, alteration of dawing, from Old English dagung, from dagian
Date: 15th century
1. : to begin to grow light as the sun rises
2. : to begin to appear or develop
3. : to begin to be perceived or understood
the truth finally dawn ed on us
II. noun
Date: 15th century
1. : the first appearance of light in the morning followed by sunrise
2. : beginning
the dawn of the space age