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hebdomad

[heb-duh-mad]
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noun
  1. the number seven.
  2. a period of seven successive days; week.
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Origin of hebdomad

1535–45; < Latin hebdomad- < Greek (stem of hebdomás week), equivalent to hébdom(os) seventh (see hepta-) + -ad- -ad1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for hebdomad

hebdomad

noun
  1. obsolete the number seven or a group of seven
  2. a rare word for week
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Word Origin

C16: from Greek, from hebdomos seventh, from heptas seven
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012