Noticed the word 'quantile' is not on the list

quantile

  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.
    Quantum + the suffix -ile

It’s a good bit uncommon. Even compared to ‘quartile’.

You could write an entry yourself and propose it to Doug or Talia via email. Would probably give this word the best odds of being added. Or maybe over Patreon, I think Doug likes that place.

If you do write a proposal entry, use these sources.