Definition
Non culpabilis is a Latin legal phrase meaning "not guilty." It is the formal pleading response by which a defendant in a civil trespass action denied liability and put the plaintiff to proof on all elements of the claim. In historical common law pleading, non culpabilis functioned as the general issue in trespass — the broadest possible denial, joining the entire matter for trial rather than contesting a specific point of law or fact. It is most commonly encountered in its abbreviated form, non cul.
Common Confusion
Non culpabilis is sometimes loosely equated with the modern criminal not-guilty plea, but the two are procedurally distinct. Non culpabilis was a civil pleading vehicle, specific to trespass actions at common law. The criminal not-guilty plea, though identical in meaning, arose in a different procedural context and was entered through different forms. Using one as a synonym for the other in historical analysis risks anachronism or category error.
Why It Matters in Research
Researchers encountering non culpabilis in historical sources should understand it as a term of art from the era of common law forms of action, not as a general statement of criminal innocence. Its significance is procedural: in the old system of pleading, selecting the general issue versus a special plea was a strategic and consequential choice that shaped what issues could be raised at trial.
The phrase appears overwhelmingly in materials predating the merger of law and equity and the abolition of the forms of action in the nineteenth century. Under the Field Code (New York, 1848) and subsequently under the Federal Rules of Civil Procedure (1938), the rigid distinction between general and special issues dissolved into notice pleading, making non culpabilis largely a historical artifact in American civil practice. Researchers working in pre-Code case law, English common law reports, or colonial-era American records will encounter it with some frequency; those working in modern materials almost never will.
The abbreviation non cul appears in older case reports and treatise indexes without explanation. A researcher unfamiliar with the full Latin form may not recognize it as a plea of not guilty, or may mistakenly associate it with criminal procedure rather than the civil action of trespass.
Do not conflate the civil procedural use with the general not-guilty plea in criminal proceedings. In criminal practice, the comparable plea has its own distinct procedural history and was entered differently. The overlap in meaning ("not guilty") masks a significant difference in procedural context.
Historical Dictionary Support
The four source dictionaries agree completely on the core meaning — not guilty — and on the standard abbreviation non cul. There is no meaningful divergence among them on the definition itself.
Burrill's Law Dictionary provides the most substantive gloss, identifying non culpabilis specifically as "the general issue in the action of trespass" and citing Blackstone's Commentaries (3 Bl. Com. 305) for the point. Burrill also preserves the emphatic Latin formula from which the term derives its name — "Et dicit quod ipse NON est inde culpabilis" ("And he says that he is not guilty thereof") — which is the most historically instructive detail across all four sources and clarifies why the plea took this particular name rather than simply adopting the English form.
Black's Law Dictionary in both editions treats the term briefly, confirming the abbreviation and the pleading context but adding little beyond what Rapalje & Lawrence and Burrill provide. None of the source dictionaries address the term's obsolescence in modern practice or explain how its function was absorbed into general denials under code and notice pleading regimes — a gap researchers should keep in mind when using these sources as navigational tools.