"hebdomad : (obsolete) A group of seven. A period of seven days; a week. (Gnosticism) A group of..."

“hebdomad : (obsolete) A group of seven.
A period of seven days; a week.
(Gnosticism) A group of seven world-creating archons (supernatural beings) often regarded as somewhat hostile; also, a term of address for the Demiurge (“a being sometimes seen as the creator of evil”).”

- https://en.wiktionary.org/wiki/hebdomad#English

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