pre-dawn
Word family
Synonym discussion
Sense: adjective/1
Pre-dawn refers strictly to the dark period just before the sun rises, while early-morning is broader and covers any time between dawn and mid-morning — a pre-dawn flight leaves while it is still dark, but an early-morning flight could board at 7 a.m. in full daylight. Daybreak is a noun for the moment the sun appears, not an adjective; you would say we left at daybreak rather than a daybreak raid. Use pre-dawn when the emphasis is on the darkness and stillness of the hour before sunrise.
Common collocations
Etymology
Formed by combining the Latin prefix pre- (meaning 'before') with the Old English noun dawn (from dagung, meaning 'daybreak'). The compound has been in use since at least the early 1800s to describe the period of darkness immediately before the first light of day.
First known use
1883
1883, in the meaning defined above