Definition
A Latin maxim from equity and contract law referring to the concealment or suppression of a material fact that one has a legal or equitable duty to disclose. The term appears most often as part of the paired maxim *suppressio veri, suggestio falsi* — "suppression of the truth is equivalent to suggestion of a falsehood" — which stands for the principle that deliberate silence about a material fact can be just as actionable as an affirmative false statement.
In legal use, suppressio describes the withholding or holding back of information in circumstances where disclosure is required, whether by duty of good faith, fiduciary obligation, or the equitable demands of a particular transaction. It is not mere silence; it is silence that misleads. The key move the maxim makes is to collapse the distinction between active lying and strategic omission: where a party suppresses what they know to be material, the law treats the result as functionally identical to a false representation.
Common Language
Modern common usage (Wiktionary): Not a standard English word in modern common use; used primarily in legal and academic Latin contexts, often specifically within the maxim *suppressio veri*.
Historical common usage (Webster's 1913): Not separately defined in Webster's 1913 as an English word; treated as a Latin term encountered in legal writing.
The term has no meaningful life outside legal and Latin scholarly contexts. Researchers encountering it in common writing are almost certainly reading a legal or quasi-legal argument.
Common Confusion
Suppressio is not the same as suppression of evidence, the procedural doctrine governing the exclusion of unlawfully obtained evidence from trial. These two concepts share a root word but operate in entirely different frameworks. Suppressio is an equitable and contractual concept focused on the duty to disclose in private dealings; suppression of evidence (as in a motion to suppress) is a constitutional and procedural concept rooted in the Fourth and Fifth Amendments and their equivalents. Conflating them — particularly when reading historical sources that use "suppression" loosely — is a significant research trap.
Why It Matters in Research
The term rarely appears alone. Researchers encountering suppressio in historical texts are almost always reading it as part of the paired maxim *suppressio veri, suggestio falsi*, and should treat both halves together. The maxim functions as a doctrinal bridge between fraud by omission and fraud by affirmative misrepresentation, and understanding that bridge is essential to tracing how courts in equity handled disclosure obligations before codified duties of disclosure existed in contract and insurance law.
In historical sources, the maxim was invoked frequently in insurance cases, land transactions, and principal-agent disputes — contexts where one party held superior information and the other relied on their good faith. Researchers working in pre-twentieth-century equity materials will encounter it as a near-formula in cases involving concealment.
A key research trap: modern legal writing has largely absorbed this Latin maxim into plain-English doctrines of fraudulent concealment and nondisclosure, so the maxim itself may disappear from view in twentieth-century materials while the underlying rule persists. Searching only for the Latin term will undercount relevant authority.
Jurisdictional variation matters here as well. Common law jurisdictions have treated the duty to disclose underlying suppressio differently across time and place — English equity courts applied it broadly; American courts varied considerably by state and transaction type. The maxim tells you the principle; it does not tell you whether the jurisdiction actually imposed a duty to speak in the case at hand.
The connection to suggestio falsi is not merely rhetorical. The two terms represent opposing poles — one is omission, the other is commission — and together they define the outer boundaries of actionable misrepresentation in equity. Researchers working on the development of fraud doctrine should track both together.
Historical Dictionary Support
Anderson's Dictionary of Law defines suppressio as the Latin for concealing or misrepresenting, literally "pressing down or under, holding back," and pairs it directly with *suggestio* (intimation) as its opposite. Anderson states the operative rule plainly: concealment of truth that should be disclosed is equivalent in effect to willful misrepresentation, and cross-references Deceit, Fraud, and Representation.
This entry captures the core equitable doctrine accurately. Anderson's framing — "which should be disclosed" — is important and sometimes understated in later treatments: the maxim does not impose a universal duty of disclosure, but activates when circumstances already create such a duty. The wrongfulness lies not in all silence, but in silence that exploits an obligation.
What Anderson does not address, and what historical dictionaries generally leave implicit, is the doctrinal question of when that duty arises. The gap between the maxim as a principle and suppressio as an actionable wrong requires the researcher to move into the substantive case law on fiduciary duty, insurance uberrimae fidei, and equitable fraud — none of which is visible from the dictionary entry alone.
Jurisdictional Note
The maxim is recognized across common law jurisdictions but its practical application varies significantly depending on the underlying transaction type and the jurisdiction's approach to duties of disclosure. English equity courts applied it with particular force in insurance (the doctrine of utmost good faith) and in dealings between parties in confidential relationships. American courts have been less uniform, and researchers should not assume that citing the maxim establishes a duty to disclose without tracing how the relevant jurisdiction has treated the underlying obligation.