Merriam-Webster
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AB INITIO Definition & Meaning - Merriam-Webster
This adverb was adopted at the beginning of the 17th century directly from Latin, where it translates as "from the beginning." (Initio is a form of the noun initium, meaning "beginning," which gave rise to such English words as initial, initiate, and initiative.) Ab initio most frequently appears in legal contexts, but it is not surprising to find it used outside of the courtroom.
Sklaw
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Void ab initio - Law Dictionary
March 17, 2023 - Void means without legal effect. Ab initio is a Latin term meaning “from the beginning”. Void ab initio, therefore, means an action that never had legal
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Reverso
dictionary.reverso.net › english-synonyms › void+ab+initio
void ab initio synonym | English synonyms dictionary | Reverso
3 dead, ineffective, ineffectual, inoperative, invalid, nonviable, nugatory, null and void, unenforceable, useless, vain, worthless n · 4 blank, blankness, emptiness, gap, lack, opening, space, vacuity, vacuum, want vb · 5 discharge, drain, eject, eliminate (Physiology) emit, empty, evacuate · 6 abnegate, cancel, invalidate, nullify, rescind Antonyms , adj · 1 abounding, complete, filled, full, occupied, replete, tenanted · English Collins Dictionary - English synonyms & Thesaurus  
Latin term meaning "from the beginning"
Wikipedia
en.wikipedia.org › wiki › Ab_initio
Ab initio - Wikipedia
4 days ago - "Void ab initio" is often contrasted with "voidable" in futuro, such documents which become void only as of the date of a certain event or of the judicial declaration to that effect.
Cambridge Dictionary
dictionary.cambridge.org › dictionary › english › ab-initio
AB INITIO | English meaning - Cambridge Dictionary
... This example is from Wikipedia and may be reused under a CC BY-SA license. The legal position was that any contract entered into beyond the power, or "ultra vires", would be deemed void "ab initio".
Free Thesaurus
freethesaurus.com › Ab-initio
Ab-initio synonyms, Ab-initio antonyms - FreeThesaurus.com
Synonyms for Ab-initio in Free Thesaurus. Antonyms for Ab-initio. 7 synonyms for ab initio: from the beginning, from the start, from the first, from scratch, from the word go, from first principles, initially. What are synonyms for Ab-initio?
Law Insider
lawinsider.com › dictionary › void-ab-initio
Void ab initio Definition | Law Insider
July 7, 2025 - Void ab initio means “null from the beginning, as from the first moment when a contract is entered into,” whereas “voidable” means “valid until annulled; especially, (of a contract) capable of being affirmed or rejected at the option ...
Quora
quora.com › In-laymans-terms-what-does-a-void-ab-initio-contract-and-voidable-contract-mean
In layman's terms, what does a void ab initio contract and voidable contract mean? - Quora
Answer (1 of 2): Void ab initio legal definition: * A contract that is void ab initio is a contract as if it never existed * A court’s ruling that a contract is void ab initio leads to the nullification of the contract from the day it was formed and not from the date of the court’s ruling * I...
Wikipedia
en.wikipedia.org › wiki › Void_(law)
Void (law) - Wikipedia
February 9, 2025 - An action, document, or transaction which is void is of no legal effect whatsoever: an absolute nullity—the law treats it as if it had never existed or happened. The term void ab initio, which means "to be treated as invalid from the outset", comes from adding the Latin phrase ab initio (from ...
Gatekeeper
gatekeeperhq.com › glossary › ab-initio
Ab Initio - Definition
Ab Initio is a Latin phrase, meaning 'from the beginning'. If a contract is "Void Ab Initio", for example, it means it was void from the beginning and cannot be altered.
Published October 16, 2025
RunSensible
runsensible.com › dictionary of legal terms › ab initio
Ab Initio - RunSensible
December 8, 2023 - In some cases, if a law or regulation is determined to be unconstitutional or invalid, a court may declare it void ab initio. This decision essentially erases the law from the legal landscape as if it were never enacted. “Void ab initio” is typically contrasted with “voidable” in futuro, such documents which become void only as of the date of a certain event or of the judicial declaration to that effect.
Practical Law
ca.practicallaw.thomsonreuters.com › w-027-8278
Void ab initio | Practical Law
Ab initio is usually italicized because it is a Latin term that means from the beginning. Void and void ab initio have the same technical definition, but void ab initio is a stronger term that is less likely to be improperly confused with voidable.
B&B Associates LLP
bnblegal.com › home › void ab initio
Void ab initio - Legal Maxim
February 28, 2025 - In Henry Ah Hoc & Another vs. The State and Another, it was held that “Void means prospectively void and void ab initio means void from its very inception, or in other words, retrospectively void, the word void as used in Article 254(1) of the Constitution.