Definition of sevennight:
(n) :
(archaic or obsolete) A period of seven consecutive days and nights; a week.
(n) :
(archaic or obsolete) (attributively) Preceded by a specified day such as Sunday, today, or yesterday: a week from the specified day.
(n) :
(obsolete) Preceded by a specified day and come: a week after the specified day.
(n) :
(obsolete) Preceded by a specified day and gone or was: a week before the specified day.