Where does “ascertaineth” come from?

ascertaineth (English) comes 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.

ascertaineth (English): third-person singular simple present indicative...

Definitions

  1. third-person singular simple present indicative...

Ancestry of “ascertaineth”, step by step

ascertaineth traces back through two separate lines of ancestry.

via English ascertain

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

via English eth

StepLanguageWordMeaning
1EnglishethA letter introduced into Old English to...
Every word from Proto-Indo-European krey-Every word from Latin certusEvery word from Vulgar Latin certanus