Simple definition:
Number indicating maximum fullness before cycle change.

Conceptual definition:
Nine is the saturation point: the limit of capacity before the transition. It represents the height of accumulation and waiting, immediately preceding the rupture that begins a new count or state.

Short, deep and ejective form. The sound is produced with the release of air, in contrast to the ingressive realization of mɔ̊ɔh (“pregnancy”), during the nine months of gestation. This expulsion rhythmically prepares the end of the series and the transition to the next cycle.