from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A group of seven.
  • n. A period of seven days; a week.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A group of seven.
  • n. A period of seven days, a week.
  • n. A group of seven superhuman beings.

from the GNU version of the Collaborative International Dictionary of English

  • n. A week; a period of seven days.

from The Century Dictionary and Cyclopedia

  • n. The number seven; the idea of seven, or the quality of being seven in number.
  • n. The sum of seven things; a collection of seven persons or things; specifically, a group of seven days; a week.
  • n. In some Gnostic systems, a group of super-human beings, angels, or divine emanations; in the systems of Basilides and Valentinus, the sphere of the Demiurge, sublunary, and lower than the ogdoad, or a title of the Demiurge himself.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any period of seven consecutive days


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, Fourth Edition)
From Late Latin hebdomas, from Ancient Greek ἑβδομάς (hebdomas, "group of seven"), from ἑπτά (hepta, "seven") (Wiktionary)


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