(n.) A burst of sunlight.

A advent alpha antemeridian appear appearance arise arrival arrive aurora auroral awakening begin beginning birth blast-off break break of day brighten brightening broad day chanticleer cockcrow cocklight come to mind commence commencement crack of dawn creation cutting edge dawning day day glow day-peep daybreak daylight dayshine dayspring daytide daytime develop dusk edge emerge emergence establishment first brightening first light flying start foundation fresh start full sun genesis gleam green flash grow bright grow light inauguration inception institution jump-off kick-off leading edge light light of day lighten matin matinal matutinal midday sun morn morning new departure noonlight noontide light occur to oncoming onset opening origin originate origination outbreak outset outstart peep of day prime ray of sunshine rise running start send-off setting in motion setting-up shine square one start start-off starting point sun spark sunbeam sunbreak sunburst sunlight sunrise sunshine sunup take-off twilight unfold vestibule of Day