From permille +‎ -ile.

permillile (plural permilliles)

1. (statistics) Synonym of millile.
   • 2013 November 1, Aaron Orkin et al., “Peak event analysis: a novel empirical method for the evaluation of elevated particulate events”, in Environmental Health‎^[1], volume 12, number 92, →DOI, archived from the original on 12 February 2025:

     Second, summary quantile statistics were computed for each of TSP, PM₁₀, PM_2.5, and PM₁ values by month: 99th percentile, and each permillile (‰ile) between 990 and 999. These permilliles permit assessment of peaks.

   • 2018 May 1, Michael J. Erickson, Brian A. Colle, Joseph J. Charney, “Evaluation and Postprocessing of Ensemble Fire Weather Predictions over the Northeast United States”, in Journal of Applied Meteorology and Climatology‎^[2], volume 57, number 5, →DOI, archived from the original on 4 February 2025, page 1139:

     Error bars in all plots represent the 25th and 975th permillile of the resampled dataset.

   • 2021 January 25, Ieva Šliaužienė et al., “Extremely preterm infant weighing 350 g: too small to survive?”, in Journal of Pediatric and Neonatal Individualized Medicine‎^[3], volume 10, number 2, →DOI, archived from the original on 1 July 2024, page 3:

     Discharge weight was 3,558 g (3rd permillile), length – 45 cm (< 3rd permillile), head circumference – 33 cm (< 3rd permillile).

• (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/ (1000)