A group or set of seven; especially a period of seven days or a week.
From Late Latin 'hebdomas,' from Greek 'hebdomas' (group of seven), derived from 'hepta' (seven). Used in religious and scientific contexts since medieval times.
The number seven captivated ancient peoples so much they created special words for it—you see this in 'hebdomad,' 'heptagon,' and the biblical significance of the seventh day, showing how cultures weaponize numbers with meaning.
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