Definition of "hebdomad" [heb•do•mad]

• A group of seven. (noun)
• A period of seven days; a week. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""hebdomad", a series corresponding to the chief divinities of the pagan pantheon: from these are derived "forces", or "souls", which alone are operative in nature, although, since they are the lowest derivatives, their efficacy is least."
• "It's Holy Week, the most important hebdomad in the Christian calendar."
• "Because we do not accept their monstrous allegations, they say that we go on living in the hebdomad [the lower regions], as if we could not lift our minds to the things on high, nor understand the things that are above."