Hebdomad
WordNet
noun
(1) Any period of seven consecutive days
"It rained for a week"
WiktionaryText
Etymology
From late Latin hebdomad, from Greek ἑβδομάς ‘group of seven’, from ἑπτά ‘seven’.
Noun
- A group of seven.
- A period of a seven days, a week.
- A group of seven superhuman beings.