We'll tell you right from the beginning where ab initio comes from. This adverb was adopted at the beginning of the 17th century directly from Latin, where it translates as "from the beginning." (Initio is a form of the noun initium, meaning "beginning," which gave rise to such English words as initial, initiate, and initiative.) Ab initio most frequently appears in legal contexts, but it is not surprising to find it used outside of the courtroom. The phrase is also used as an adjective meaning "starting from or based on first principles" (as in "predicted from ab initio calculations").
Example Sentences
Recent Examples on the WebWhat McConnell needed to do, for his argument to establish its conclusions, was to provide independent grounds of some kind for ruling out Interpretation B ab initio. Jason Lee Steorts, National Review, 15 May 2021 Moreover, the Executive Order exceeds the President’s authority and is therefore ultra vires and void ab initio. Eriq Gardner, Billboard, 4 Sep. 2020