Back-formation from quantity, modeled on percentile. By surface analysis, quant(ity) +‎ -ile.

• IPA^(key): /ˈkwɒn.taɪl/

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quantile (plural quantiles)

1. (statistics) One of the class of values of a variate which divides the members of a batch or sample into equal-sized subgroups of adjacent values or a probability distribution into distributions of equal probability.
   • 2011 January 31, Anil K. Bera, Aurobindo Ghosh, Zhijie Xiao, “FRACTILES ON QUANTILE REGRESSION WITH APPLICATIONS”, in Mathematics Subject Classification‎^[1], archived from the original on 12 September 2025, page 18:

     It should be noted that quantile regression controls for the quantiles of the y variable, and not of the original covariate i.e. the x variable.

• (statistics):
• median (2-quantile), tercile/tertile (3), quartile (4), pentile/quintile (5), sextile (6), septile (7), octile (8), decile (10), hexadecile (16), ventile/vigintile (20), centile/percentile (100), millile/permillile (1000)

• fractile

• 👁 Image
  quantile on Wikipedia.Wikipedia

• quintale, Quintela, Talnique