the first appearance of daylight in the morning: Dawn broke over the valley.
2.
the beginning or rise of anything; advent: the dawn of civilization.
verb (used without object)
3.
to begin to grow light in the morning: The day dawned with a cloudless sky.
4.
to begin to open or develop.
5.
to begin to be perceived (usually followed by on ): The idea dawned on him.
Origin: before 1150;Middle Englishdawen (v.), Old Englishdagian, derivative of dægday; akin to Old Norsedaga,Middle Dutch,Middle Low Germandagen,Old High Germantagēn
c.1500, shortened from dawning, dawing (c.1300), from O.E. dagung, from dagian "to become day," from root of dæg "day" (see day). Probably influenced by a Scandinavian word (cf. Dan. dagning, O.N. dagan). The noun is first recorded c.1600.