# ab initio

> English word · Adverb · IPA /ˌæb ɪˈnɪʃ.i.oʊ/

## Definitions
1. From the time when a law, legal right or decree, contract, ownership interest, partnership (etc.) comes into force.
2. Calculated from first principles, i.e. from basic laws without any further additional assumptions.
3. Taken with no prior qualifications.

## Etymology
From Latin ab (“from”) + initiō, ablative singular of initium (“beginning”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/ab-initio