First Known Use: 1545
Dictionary
hebdomad
noun heb·do·mad \ˈheb-də-ˌmad\
Definition of HEBDOMAD
1
: a group of seven
2
: a period of seven days : week
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Origin of HEBDOMAD
Latin hebdomad-, hebdomas, from Greek, from hebdomos seventh, from hepta seven — more at seven
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