Definition of ab initio in English:

ab initio

Syllabification: ab in·i·ti·o
Pronunciation: /ˌab əˈniSHēˌō


  • From the beginning (used chiefly in formal or legal contexts): the agreement should be declared void ab initio
    More example sentences
    • Enormous as the difference undoubtedly is between these faculties in the two cases, the difference is conceded not to be one existing ab initio.


[attributive] Back to top  
  • Starting from the beginning: he was instructing ab initio pilots
    More example sentences
    • While ab initio prediction is clearly the most difficult, it is arguably the most useful approach.
    • It is likely that the ab initio approaches will help reduce some of the limitations of comparative modeling.
    • The first ab initio candidates will be selected by the middle of next month.


early 17th century: Latin.

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grotesque quality or grotesque things collectively