The early part of the day or the period just before the main part of the day begins.
From 'fore-' (before, front) plus 'day' from Old English 'dæg'. Archaic or poetic term for early morning hours.
In Shakespeare's time, 'foreday' was used to describe those pre-dawn hours when servants would be stirring and preparing the household—it marks the boundary between night watch and day's work!
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