D defs.my
Entry 1 sense Webster, 1913

Week

/wēk/ · IPA /wik/
01 n. A period of seven days, usually that reckoned from one Sabbath or Sunday to the next.
  1. 1.
    A period of seven days, usually that reckoned from one Sabbath or Sunday to the next.
    “I fast twice in the week.” — Luke xviii. 12.
Phrases & compounds
Feast of Weeks — See Pentecost, 1.
Prophetic week — a week of years, or seven years.
Week day — See under Day.