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Cornell Law School
law.cornell.edu › lii › wex › ab initio
ab initio | Wex | US Law | LII / Legal Information Institute
Ab initio is a Latin term that means "from the beginning” or “from inception.” Ab initio is used to indicate that some fact existed from the start of a relevant time period.
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Termscout
resources.termscout.com › contract-insights › ab-initio
Ab Initio Definition and Importance in Legal Terms
September 4, 2025 - In business, it applies to data analysis, decision-making, and problem-solving that starts without bias. In law, ab initio is used to describe contracts, clauses, or agreements that are considered invalid or void from the beginning.
Latin term meaning "from the beginning"
Ab initio (/ˌæb ɪˈnɪʃioʊ/ AB in-ISH-ee-oh) is a Latin term meaning "from the beginning" and is derived from the Latin ab ("from") + initio, ablative singular of initium ("beginning"). Ab initio was … Wikipedia
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Wikipedia
en.wikipedia.org › wiki › Ab_initio
Ab initio - Wikipedia
2 weeks ago - Ab initio (/ˌæb ɪˈnɪʃioʊ/ ... including the following: In law, ab initio refers to something being the case from the start or from the instant of the act rather than from when the court declared it so....
People also ask

Why is ab initio important in contract law?
It ensures that agreements violating legal principles are nullified entirely, protecting parties from unfair or illegal obligations.
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upcounsel.com
upcounsel.com › ab-initio-definition-law
Check out this article...Ab Initio Meaning in Law: Definition, ...
What are the consequences of a contract being deemed ab initio?
When a contract is deemed void ab initio, it is considered null and void from the beginning. This means that neither party can enforce the terms of the contract, and any obligations or rights arising from the contract are extinguished.
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clio.com
clio.com › resources › legal dictionary › term
Ab Initio | Legal Dictionary | Clio
What are examples of void ab initio contracts?
Contracts formed under duress, fraud, illegality, or lack of capacity are void ab initio.
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upcounsel.com
upcounsel.com › ab-initio-definition-law
Check out this article...Ab Initio Meaning in Law: Definition, ...
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The Law Dictionary
thelawdictionary.org › the law dictionary › articles › contracts
Why Ab Initio Is a Big Deal in Contract Law
July 20, 2022 - As stated above, ab initio means “from the start.” Therefore, if a court declares something to be the case ab initio, it typically means that the court’s ruling on it applies from when an act occurred or when the circumstances for the ...
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PracticePanther
practicepanther.com › home › legal terms › ab initio
Ab Initio | PracticePanther
December 15, 2020 - In the legal context, the Latin term “ab initio” refers to something (for example a fact, an act, a document) that was present from the beginning. It is often used as part of the phrase “void ab initio,” meaning something — such as ...
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UpCounsel
upcounsel.com › ab-initio-definition-law
Check out this article...Ab Initio Meaning in Law: Definition, Usage, and Examples
Ab Initio Meaning: A Latin term meaning "from the beginning" or "from inception." A contract void ab initio is treated as though it never existed. Abuse of Rights: Legal rights can be revoked if they are abused, leading to the wrongful conduct ...
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RunSensible
runsensible.com › dictionary of legal terms › ab initio
Ab Initio - RunSensible
December 8, 2023 - "Ab initio" is a Latin term that means "from the beginning" or "from the outset." In the context of law, it signifies that a contract or action is void from
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TheFreeDictionary.com
legal-dictionary.thefreedictionary.com › ab+initio
Ab initio legal definition of ab initio
Collins Dictionary of Law © W.J. Stewart, 2006 · AB INITIO, from the beginning. 2. When a man enters upon lands or into the house of another by authority of law, and afterwards abuses that authority, he becomes a trespasser ab initio.
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Clio
clio.com › resources › legal dictionary › term
Ab Initio | Legal Dictionary | Clio
Ab Initio is a Latin term commonly used in the legal field to refer to something that is considered from the beginning or from the start. In a legal context, it ofte...
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Sklaw
sklaw.au › home › dictionary › ab initio
Ab initio - Law Dictionary
November 15, 2023 - Ab initio is a Latin term, meaning: “from the beginning”. It refers to something being the case from the start, or from the instant a certain act was performed. In the context of contract law, a contract may be “void ab initio”. This ...
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Legal Choices
legalchoices.org.uk › home › law dictionary
What does Ab initio mean - Law dictionary
Definition of Ab initio. Latin phrase - From the start of something. If a court rules that something is in effect ab inito it means the ruling applies from when the act took place and not when the court made the decision.
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Uslegalforms
legal-resources.uslegalforms.com › us legal forms › legal definitions › ab initio
Ab Initio: Understanding Its Legal Definition and Implications | US Legal Forms
For instance, if a contract is deemed void ab initio, it means that the contract was never valid or enforceable from the moment it was created. Access 85,000+ trusted legal forms and simple tools to fill, manage, and organize your documents. ... Contract Law: Contracts that are void ab initio cannot be enforced.
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Gatekeeper
gatekeeperhq.com › glossary › ab-initio
Ab Initio - Definition - Gatekeeper
If a contract is "Void Ab Initio", for example, it means it was void from the beginning and cannot be altered. Gatekeeper makes it easy to search for this terminology in your contracts through its powerful OCR technology.
Published   October 16, 2025
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Justia
dictionary.justia.com › ab initio
ab initio Definition, Meaning & Usage | Justia Legal Dictionary
ab initio - A Latin term in law indicating something was legal or in effect from the very beginning
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Law definer
lawdefiner.com › ab-initio-meaning
Ab Initio Meaning in Law: Full Legal Definition (2026)
March 18, 2026 - Quick Answer: Ab initio is a Latin phrase meaning “from the beginning.” In law, it describes something — a contract, a marriage, an act — that was invalid from the very moment it was created, not just from the date a court ruled on it.
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LSD.Law
lsd.law › home › legal definitions › ab initio
What is ab initio? Simple Definition & Meaning · LSD.Law
November 12, 2025 - Ab initio is a Latin term meaning "from the beginning" or "from inception." In legal contexts, it indicates that a particular fact or condition existed from the very start of a relevant period.
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Legal Explanations
legal-explanations.com › definition › ab-initio
Ab Initio Definition and Legal Meaning
Ab Initio is a Latin phrase that means "from the start" or "from scratch." In legal terms, it refers to something that is null and void from the beginning of its existence and not just from the moment it is declared void.
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LegalBrief AI
legalbriefai.com › legal-terms › ab-initio
ab initio - Meaning in law and legal documents, Examples and FAQs | LegalBrief AI
In a contract, if something is declared "ab initio," it means that the contract is treated as if it was never valid from the very beginning. This can happen if there was a major mistake or if the contract was based on false information. In court cases, "ab initio" can be used to argue that ...
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JustAnswer
justanswer.com › law › 55l2q-ab-initio-mean-english-please.html
Ab Initio Meaning Explained – Legal Term Definition
June 20, 2011 - "Ab initio" is a Latin phrase meaning "from the beginning." In legal contexts, it indicates that something is considered invalid or effective from the outset. For example, a contract declared void ab initio is treated as never having existed.
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FindLaw
dictionary.findlaw.com › findlaw legal dictionary › ab initio
Ab Initio - FindLaw Dictionary of Legal Terms
January 28, 2013 - (Required) More Options · Name Search · Browse Legal Issues · Browse Law Firms · Support · term: ab initio adv · [Latin] : from the beginning [a contract found to be void ab initio] Source: Merriam-Webster’s Dictionary of Law ©1996.