vigintile

From Latin viginti (“twenty”) + -ilis (“forming adjectives”).

vigintile (plural vigintiles)

1. (statistics) Any of the values in a series that divides the distribution of individuals in that series into twenty groups of equal frequency.
2. Any one of the twenty groups so divided.

• quantile

• (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), millile (1000)