Etymology
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ennead (n.)

"group of nine things," 1650s, from Greek enneas (genitive enneados) "group of nine," from ennea "nine" (see nine). Especially in reference to the divisions of Porphyry's collection of the neo-Platonic doctrines of Plotinus. Related: enneadic.

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Definitions of ennead

ennead (n.)
the cardinal number that is the sum of eight and one;
Synonyms: nine / " / ix / niner / Nina from Carolina
From wordnet.princeton.edu