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“heptad”
1. Numbers that have a total of seven: "The days of the week come in groups of heptads."
2. A group, or groups, of seven things: "Many mothers have a constant heptad of days as they take care of their children."
2. A group, or groups, of seven things: "Many mothers have a constant heptad of days as they take care of their children."
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hepta-, hept-
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