Definition of ab initio in English:

ab initio

adverb

Law
formal
  • From the beginning.

    ‘the agreement should be declared void ab initio’
    • ‘Enormous as the difference undoubtedly is between these faculties in the two cases, the difference is conceded not to be one existing ab initio.’
    from the beginning, from the start, initially, originally, from first principles, to begin with, to start with, primarily
    da capo
    from scratch, from the word go
    from the beginning, from the start, initially, originally, from first principles, to begin with, to start with, primarily
    da capo
    from scratch, from the word go
    View synonyms

adjective

Law
formal
  • [attributive] Starting from the beginning.

    ‘he was instructing ab initio pilots’
    • ‘Through this process, we can develop new techniques for applying ab initio methods and begin to predict when these new techniques will be necessary.’
    • ‘The first ab initio candidates will be selected by the middle of next month.’
    • ‘It is likely that the ab initio approaches will help reduce some of the limitations of comparative modeling.’
    • ‘We start by presenting results obtained through ab initio calculations for uniformly charged graphene layers, semiconducting and metallic carbon nanotubes.’
    • ‘While ab initio prediction is clearly the most difficult, it is arguably the most useful approach.’

Origin

Early 17th century: Latin.

Pronunciation:

ab initio

/ˌab əˈniSHēˌō/