Where does “underascertainment” come from?

underascertainment (English) comes from English ascertainment, from English ascertain, from Middle English acerteynen, from Old French acertener, from Old French certain, from Vulgar Latin certanus, from Latin certus, from Proto-Indo-European krey- — to sift, separate, divide.

underascertainment (English): Insufficient ascertainment

Definitions

  1. Insufficient ascertainment

Ancestry of “underascertainment”, step by step

underascertainment traces back through two separate lines of ancestry.

via English ascertainment

StepLanguageWordMeaning
1EnglishascertainmentThe act of ascertaining
2EnglishascertainTo find out definitely; to discover or establish;...
3Middle Englishacerteynen
4Old Frenchacertenerto assure; to make sure of, to make certain of
5Old Frenchcertaincertain; sure
6Vulgar Latincertanuscertain
7Latincertuscertain; fixed, settled, firm; resolved,...
8Proto-Indo-Europeankrey-to sift, separate, divide

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European krey-Every word from Latin certusEvery word from Vulgar Latin certanus