
1) From the beginning 2) Latin legal terminology
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https://www.crosswordclues.com/clue/ab-initio

A calculation or prediction that is based purely on theory rather than on experimental data. Accurate ab initio predictions are an important test of a theory. (Lat., 'from first principles')
Found on
http://antoine.frostburg.edu/chem/senese/101/glossary/a.shtml

Ab initio (oʊ {respell|AB|i|NISH|ee-oh}) is a Latin term meaning `from the beginning` and is derived from the Latin ab (`from`) + initio, ablative singular of initium (`beginning`). ==Etymology== c.1600, from L., lit. `from the beginning`, from ablative case of initium `entrance, beginning`, related to verb inire `to go into, enter upo...
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http://en.wikipedia.org/wiki/Ab_initio

from first principles
Found on
http://www.chemistry-dictionary.com/definition/ab+initio.php

The Latin term 'Ab initio ' means, in a UK legal context: 'from the beginning'.
Found on
http://www.encyclo.co.uk/local/20456

(In topic `Data Warehousing & BI`) An ETL popular in the USA from the Lexington based company of the same name.
Found on
http://www.encyclo.co.uk/local/20477

prep. Latin phrase meaning "from the start"; literal meaning being something done 'from scratch'. In legal parlance it stands from: 1.) if any legal agreement is void ab initio then it stands null and void from the very beginning of its intended existence and not just from the instant its declared as void. 2.) if a person enters onto some...
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http://www.encyclo.co.uk/local/21213

Lat. 'from the beginning'. Usually used in reference to contracts, estates, trespasses and deeds to indicate their existence or validity relates back to their creation like an (unlawful) marriage 'ab initio' meaning the marriage was void during its entire alleged existence.
Found on
http://www.lectlaw.com/def/a119.htm

Type: Term Pronunciation: ahb i-nish-ē-ō Definitions: 1. From the beginning.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=110

Ab initio is Latin for from the beginning
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http://www.probertencyclopaedia.com/Y.HTM

ab initio; ab inti From the beginning. The Latin equivalent of `from the start” or `from inception”.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2357/2

Latin meaning 'from first principles'.
Found on
https://www.encyclo.co.uk/local/20687

from the beginning.
Found on
https://www.infoplease.com/dictionary/ab-initio*
No exact match found.