Definition

1. Noun:
   • The cardinal number that is the sum of seven and one; eight: "Ogdoad" is a formal or literary term for the number eight, or a group or set of eight things.

Usage Examples

• Noun:
  • The ancient cosmology was based on an ogdoad of primordial deities.
  • In some mystical traditions, the ogdoad represents a perfect or complete number.

Advanced Usage

• Theological/Philosophical Context: Often used in discussions of ancient Egyptian religion (the Ogdoad of Hermopolis) or Gnosticism to refer to a group of eight primordial beings or concepts.
  • The Ogdoad in Egyptian myth consisted of four pairs of male and female deities.

Variants and Related Words

• Octad (n): Another term for a group or set of eight.
• Octet (n): A group of eight people or things, commonly used in music (a group of eight performers) or computing (eight bits).
• Octonary (n/adj): Relating to or based on the number eight.

Synonyms

• Eight: The common cardinal number.
• Octave: A group of eight, especially in music (the interval between one musical pitch and another with double its frequency) or poetry (an eight-line stanza).

Related Phrases and Idioms

(This word is highly specific and technical; it is not commonly used in everyday idioms or phrasal verbs.)

Noun

1. the cardinal number that is the sum of seven and one