adjective
At a time in advance of the usual or expected event.
Arriving a time before expected; sooner than on time.
After but close to the start of a period of time.
In the starting hours of the day.
Having begun to occur; in its early stages.
(astronomy) Of a star or class of stars, hotter than the sun.
noun
(informal) A shift (scheduled work period) that takes place early in the day.
adverb
At a time before expected; sooner than usual.
Soon; in good time; seasonably.