Definition
A Latin maxim meaning, literally, "it is one thing to conceal." The phrase is the opening clause of the fuller maxim *aliud est celare, aliud tacere* — "it is one thing to conceal, it is another to be silent." In legal usage, the maxim draws a distinction between active concealment of a fact and mere silence or failure to volunteer information. Active concealment has historically been treated as closer to fraud; silence alone, in many legal contexts, gives rise to no legal duty and no liability.
The maxim is invoked in discussions of fraud, misrepresentation, and disclosure obligations to mark the boundary between conduct that is actionable and conduct that is not. A party who takes affirmative steps to hide a material fact — burying documents, making misleading statements, or physically concealing a defect — stands in a different legal position from one who simply does not speak up. The maxim encodes that distinction in a portable, citation-ready form.
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Common Confusion
The maxim is sometimes cited as though it settles the question of whether silence constitutes fraud. It does not. The distinction between concealment and silence matters only as a starting point; modern courts in many jurisdictions impose affirmative disclosure duties based on fiduciary relationships, confidential relationships, statutory obligations, or the existence of a prior misleading statement. In those contexts, silence itself becomes actionable, collapsing the very distinction the maxim draws. Researchers should resist treating *aliud est celare* as a complete rule and read it instead as a framing device for the threshold inquiry.
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Why It Matters in Research
This maxim appears most often in older common law fraud and contract cases and in treatises on misrepresentation. Its practical significance has shifted over time. In the nineteenth century, the common law rule of *caveat emptor* gave the distinction genuine bite: sellers were generally under no duty to disclose defects, so the line between concealment (potentially fraudulent) and silence (generally not) carried real legal consequence. As disclosure duties expanded — through equity, consumer protection statutes, real property disclosure requirements, and the development of implied duties in relational contracts — the maxim's practical reach narrowed.
When researching in historical sources, note that courts and treatise writers often cited the maxim without unpacking which side of the line the facts fell on. A case invoking *aliud est celare* may be doing one of several things: affirming that active concealment is fraud, distinguishing a defendant's conduct as mere silence, or acknowledging the rule while creating an exception for a particular relationship type. Read the surrounding analysis carefully.
The maxim does not appear to have been assigned a standalone entry in Black's 2nd Edition; the source material provided does not contain a direct entry for this phrase. Researchers consulting historical Black's editions should check the fraud and misrepresentation entries, as well as entries under related maxims, for contextual use of the phrase. Its natural home in the Law Mind corpus is in materials on fraud, concealment, and disclosure rather than in dedicated maxim entries.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) does not appear to include a dedicated entry for *aliud est celare* based on available source material. The phrase is a Latin maxim of the kind that nineteenth-century legal dictionaries often treated as self-explanatory or embedded within longer fraud-related entries rather than catalogued independently.
The fuller maxim — *aliud est celare, aliud tacere* — is attributed to Roman legal and rhetorical sources and was adopted into common law commentary through the works of writers on equity and contract. Cicero used a closely related formulation in the context of ethical obligations in commerce. Common law treatise writers, particularly those writing on the law of fraud and misrepresentation in the eighteenth and nineteenth centuries, carried it into Anglo-American legal discourse.
The historical record is thin at the dictionary level but richer in treatise and case commentary. Researchers working in pre-twentieth-century sources should expect to find the maxim cited in the middle of analytical passages rather than defined in isolation.
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Jurisdictional Note
The distinction the maxim encodes — concealment versus silence — varies significantly by jurisdiction and by transaction type. Disclosure obligations in real property transactions, for example, are now heavily statutory in most U.S. states, making the common law baseline less relevant in practice. The maxim retains more force as a conceptual tool in jurisdictions or contexts where statutory disclosure regimes are absent or limited.
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