Definition
Criminality refers to the quality or condition of being criminal — that is, the degree to which conduct constitutes, or is sufficient to constitute, a crime under applicable law. The term operates at several levels of abstraction:
1. As a general condition: The state of being criminal; the character of an act, omission, or course of conduct that renders it punishable under penal law. Used to describe whether behavior rises to the threshold of criminal liability as opposed to civil wrong or mere social deviance.
2. As an evidentiary standard: In extradition law, criminality functions as a technical threshold requirement. A demanding party must demonstrate "evidence of criminality" sufficient under the laws of the requested jurisdiction to justify arrest and commitment for trial, as though the offense had been committed there. This is the meaning most precisely defined in legal sources and most frequently litigated in historical courts.
3. As a characteristic or pattern: In criminology-adjacent legal contexts, criminality may describe a persistent propensity or pattern of criminal behavior — used in sentencing, parole determinations, and character assessments. This usage is looser and more evaluative than the evidentiary sense.
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Common Language
Modern common usage (Wiktionary): The state of being criminal; criminal activity; a criminal act.
Historical common usage (Webster's 1913): "The quality or state of being criminal; that which constitutes a crime; guiltiness; guilt."
The ordinary meaning and the legal meaning overlap substantially but diverge at the margins. In common usage, criminality often describes a moral quality — guilt, wickedness, deviance. In legal usage, particularly in extradition and treaty law, criminality is a precise evidentiary standard: does the demonstrated conduct satisfy the legal threshold for arrest and commitment under the law of the requested jurisdiction? A morally blameworthy act is not necessarily "criminality" in this technical sense if it does not map onto a recognized offense in the forum state. Researchers should be alert to which register a source is using.
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Why It Matters in Research
The term criminality is deceptively familiar and therefore easy to misread in historical sources. Several navigational points apply:
First, the extradition context is the most legally precise use of the term in the historical corpus. Bouvier's entry points directly to the Webster-Ashburton Treaty of 1842 (U.S.-Great Britain), which established the evidentiary formula that a requesting party must show "such evidence of criminality" as would justify arrest in the requested state. This dual criminality principle — the requirement that the alleged conduct be criminal under both jurisdictions — became foundational to extradition law. When encountering the phrase "evidence of criminality" in 19th-century case law or treaty commentary, researchers should understand it as a term of art, not a general moral characterization.
Second, Bouvier's entry is truncated in the available corpus ("refers to the scope of th—"), which means researchers relying solely on that source will miss the full doctrinal elaboration. This is a known gap. Independent consultation of the full Bouvier's entry and 19th-century extradition treatises is advisable.
Third, the dual criminality dimension connects this term to comparative criminal law research. Whether a foreign act constitutes "criminality" for extradition purposes required courts to analyze foreign law, creating a body of case law that is historically important but easy to overlook when searching under more obvious headings like "extradition" alone. Searching under "criminality" as a distinct term will surface a different slice of that material.
Fourth, in modern sentencing and criminal history contexts, criminality has drifted toward aggregate assessment — prior criminality, pattern of criminality — which has a different evidentiary and procedural footing than the treaty-law usage. Researchers moving between historical and contemporary sources should track which usage is operative.
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Historical Dictionary Support
Bouvier's Law Dictionary treats criminality primarily through the lens of extradition, anchoring its definition to the Webster-Ashburton Treaty and the evidentiary standard it imposed. This is a notably narrow entry for a term with broader conceptual reach, reflecting the practical orientation of Bouvier's toward working lawyers and judges who would most commonly encounter the term in precisely that context.
Webster's 1913 offers the fuller conceptual definition — quality or state of being criminal — and cites Blackstone's observation that criminality cannot be reduced to a single criterion, acknowledging the evaluative complexity of the concept. This general philosophical register is largely absent from Bouvier's, which moves straight to the operational question of what evidence suffices.
Neither source engages with criminality as a sociological or criminological category, a usage that became more prevalent in the late 19th and early 20th centuries as criminal justice discourse absorbed positivist and behavioral influences. Researchers working on the history of criminal law theory or penology will find the historical legal dictionaries thin on this dimension and should supplement with period encyclopedias and treatise literature.
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Jurisdictional Note
In the extradition context, criminality is inherently a comparative and bilateral concept — what constitutes criminality depends on the laws of both the requesting and requested states. Domestic U.S. criminal law does not use criminality as a formal term of art in the same way; the equivalent inquiry goes to elements of the offense, mens rea, and actus reus under applicable state or federal statute.
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Encyclopedia Cross-Reference
Criminal Law — Corporate Criminal Liability (The Law Mind Criminal Law Encyclopedia) — relevant for the threshold question of what conduct and what actors meet the standard of criminality under modern doctrine.
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