noun heb·do·mad \ˈheb-də-ˌmad\

Definition of hebdomad

  1. 1 :  a group of seven

  2. 2 :  a period of seven days :  week

Origin and Etymology of hebdomad

Latin hebdomad-, hebdomas, from Greek, from hebdomos seventh, from hepta seven — more at seven

First Known Use: 1545

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