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Greek ennea, nine.

An enneagram is a nine-sided figure used in one system of analysis to represent the spectrum of possible personality types; an enneagon (Greek ‑gōnos, angled) is a nine-sided plane figure; an enneahedron (Greek hedra, seat, base) is a solid figure having nine faces; ennead is a group or set of nine. See also nona‑ and the entry Number words.

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