Hebdomad

noun

1. A group of seven.
2. A period of seven days; a week.
3. The number seven; the idea of seven, or the quality of being seven in number.
4. The sum of seven things; a collection of seven persons or things; specifically, a group of seven days; a week.
5. In some Gnostic systems, a group of super-human beings, angels, or divine emanations; in the systems of Basilides and Valentinus, the sphere of the Demiurge, sublunary, and lower than the ogdoad, or a title of the Demiurge himself.