From Longman Dictionary of Contemporary Englishdawndawn1 /dɔːn $ dɒːn/ ●●○ noun [countable, uncountable] 1 TMCthe time at the beginning of the day when light first appears syn daybreak, → duskat dawn The boats set off at dawn. When dawn broke (=the first light of the day appeared), we were still 50 miles from Calcutta. I was up at the crack of dawn (=very early in the morning) to get the plane. We worked from dawn to dusk (=through the whole day while it is light). the cold light of dawn2 → the dawn of civilization/time etc3 → a false dawn
Examples from the Corpusdawn• But even at 6: 30 at night, there can be a dawn.• The cowbird lays her egg at dawn.• One morning she rose at dawn and climbed Ballymacadoyle Hill, behind the fort.• Eck therefore had a whole night's steaming to put himself a hundred miles from the sinking before submerging at dawn.• Waking with a start, she lay in the grey half-light of dawn, wondering where she was.• It had been the hope which had kept her going through the dawn and early morning.• We talked almost until dawn.• There, we spent a night at a Yonchon inn and waited until dawn to make our getaway.at dawn• An ice storm at dawn paralyzed St. Louis traffic.