ab initio

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ab initio

  • /ˌæb ɪˈnɪʃ.i.oʊ/ US
  • /ˌæb əˈnɪt.i.oʊ/ US
  • /ˌɑb əˈnɪt.i.oʊ/ US

Where it comes from

Unadapted borrowing from Latin ab initiō (“from the beginning”), from ab (“from”) + initiō, ablative singular of initium (“beginning”).

adverb ab init

  1. From the time when a law, legal right or decree, contract, ownership interest, partnership (etc.) comes into force. As the Act was passed without the required quorum, the constitutional court struck down the Act and declared it to be void ab initio
  2. Calculated from first principles, i.e. from basic laws without any further additional assumptions. […] this soul does not exist ab initio, as orthodox Christianity teaches; it has to be brought into existence by a process of guided self-observation. However, this is rarely achieved, owing to man's unique ability to be distracted from spiritual matters by everyday trivia.
  3. of an academic course Taken with no prior qualifications.

Translations

Every language

adv referring to the time from when a legal document comes into force

Españolab initio, desde el principio
हिन्दीआदितः āditaḥ
Русскийс возникнове́ния s vozniknovénija, от нача́ла ot načála

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MLA

"ab initio." Wiktionary, via Micwyn, micwyn.com/word/ab%20initio. Accessed 6 Nov. 2026.

APA

ab initio. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/ab%20initio

Chicago

"ab initio." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/ab%20initio.

BibTeX
@misc{ab_initio_2026,
  title = {ab initio},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/ab%20initio},
  urldate = {2026-11-06}
}