*ennead*

n. [ Gr. &unr_;, &unr_;, fr. 'enne`a nine. ] The number nine or a group of nine. [ 1913 Webster ]

The Enneads, the title given to the works of the philosopher Plotinus, published by his pupil Porphyry; -- so called because each of the six books into which it is divided contains nine chapters. [ 1913 Webster ]