Noun
A group of nine, particularly (music) a tuplet of nine notes.
Coordinate terms: singlet, couplet, triplet, quadruplet, tetraplet, pentuplet, sextuplet, septuplet, octuplet, decuplet, centuplet, multiplet
One of a group of nine, particularly one of nine babies born from the same mother at one time.
Source: en.wiktionary.org