- the number seven.
- a period of seven successive days; week.
Origin of hebdomad
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- obsolete the number seven or a group of seven
- a rare word for week
Word Origin for hebdomad
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