noun
1.
the first appearance of light in the morning
birds which sing at dawn
Synonyms: aurora, cockcrow, cockcrowing, dawning, daybreak, daylight, light, morn, morning, sunrise, sunup
Related Word: prime
Idioms: break of day, crack of dawn, first blush ( or flush) of day, first light, peep of day, the wee small hours
2.
Synonyms: beginning , alpha, commencement, dawning, genesis, onset, opening, outset, outstart, start
Antonyms: sunset