■ noun
1》 a period of seven days.
↘the period of seven days generally reckoned from and to midnight on Saturday night.
↘ Brit. (preceded by a specified day) a ~ after (that day): the programme will be broadcast on Sunday ~.
2》 the five days from Monday to Friday, or the time spent working during this period.
Origin
OE wice , of Gmc origin, from a base prob. meaning 'sequence, series'.