(n.) The beginning of the day, or first appearance of light; the dawn; hence, the beginning.

alpenglow arch aurora aurora australis aurora borealis aurora glory aurora polaris break of day brightening chanticleer cockcrow cocklight crack of dawn crepuscule dawn dawning dawnlight day-peep daybreak daylight dayspring first brightening first light foredawn glow half-light light merry dancers morn morning morning twilight northern lights peep of day polar lights polar ray prime southern lights sunrise sunup the small hours twilight vestibule of Day