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1. A group of seven.
2. A period of seven days; a week.

[Latin hebdomas, hebdomad-, the number seven, from Greek, from hebdomos, seventh, from hepta, seven; see septm̥ in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. obsolete the number seven or a group of seven
2. a rare word for week
[C16: from Greek, from hebdomos seventh, from heptas seven]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈhɛb dəˌmæd)

1. a group of seven.
2. a period of seven days; week.
[1535–45; < Latin hebdomad- < Greek (s. of hebdomás week) =hébdom(os) seventh (see hepta-) + -ad- -ad1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hebdomad - any period of seven consecutive dayshebdomad - any period of seven consecutive days; "it rained for a week"
period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
calendar day, civil day - a day reckoned from midnight to midnight
day of the week - any one of the seven days in a week
week from Monday - a time period of a week or more; "a week from Monday will be too soon!"
weekend - a time period usually extending from Friday night through Sunday; more loosely defined as any period of successive days including one and only one Sunday
rag week, rag - a week at British universities during which side-shows and processions of floats are organized to raise money for charities
Holy Week, Passion Week - the week before Easter
shibah, shiva, shivah - (Judaism) a period of seven days of mourning after the death of close relative; "the family is sitting shiva"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
I am indebted to Deborah Gera for drawing my attention to this article; she also suggests that there may conceivably have been a double hebdomad of the Seven against Thebes and the Seven Champions in Thebes.
Brisson next offers a remarkably nuanced portrayal of Kronos as summit of the intellective hebdomad in Proclus's interpretation of the Chaldaean Oracles.
Pierre Hadot, "Dieu comme acte d'etre dans le neoplatonisme," in Dieu et L'Etre (Paris: Etudes Augustiniennes, 1978), 57-63, building upon the work of de Vogel, argues that the idea of God as infinite being and the pure act of existence from which all beings receive their existence is found in the Neoplatonic anonymous commentary on the Parmenides (which Hadot attributes to Porphyry) and was communicated to Aquinas through Boethius's Hebdomads. Wayne Hankey has continuously argued that Aquinas should be understood as continuing the Neoplatonic tradition conveyed to him by Dionysius and Erigena; see for instance, his "Aquinas's First Principle: Being or Unity"Dionysius 4 (1980): 133-73.
An Exposition of the "On the Hebdomads" of Boethius.
He begins his main argument by laying out nine hebdomads, or self-evident "common conception[s] of the mind" (gloss, II.8 and III.15, pp.