1. Plural of ennead; groups or sets of nine items, people, or units.
Usage: Most common in mathematics, philosophy, and religious contexts.
2. In Neoplatonic philosophy, a group of nine treatises by Plotinus, organized into six groups of nine by his student Porphyry.
Usage: Proper noun in philosophical contexts; refers to a specific classical text.

Examples

• The ancient Egyptians organized their gods into enneads, or groups of nine deities.
• Porphyry arranged Plotinus's writings into enneads to make them more systematic.
• The mathematician divided the numbers into enneads for easier analysis.
• Several enneads of monks gathered for the religious ceremony.
• The Ennead is one of the most important texts in Neoplatonic philosophy.