different between nonile vs octile

Italian

nonile m (plural nonili)

octile (plural octiles)

(statistics) Any of the quantiles that divide an ordered sample population into eight equally numerous subsets.
(statistics, by extension) A subset thus obtained.
(astronomy) An octant.

(statistics): median (2-quantile), tercile/tertile (3), quartile (4), quintile (5), sextile (6), septile (7), octile (8), decile (10), hexadecile (16), ventile/vigintile (20), centile/percentile (100)

Send