Where does “ascertainably” come from?

ascertainably (English) comes from English ascertainable, 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.

ascertainably (English): In a way that can be ascertained

Definitions

  1. In a way that can be ascertained

Ancestry of “ascertainably”, step by step

ascertainably traces back through two separate lines of ancestry.

via English ascertainable

StepLanguageWordMeaning
1EnglishascertainableAble to be ascertained
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 ly

StepLanguageWordMeaning
1EnglishlyAbbreviation of light-year
2VietnameselyAlternative spelling of li
Every word from Proto-Indo-European krey-Every word from Latin certusEvery word from Vulgar Latin certanus