Definition
A Roman civil law term for building material or timber. In its narrowest sense, *tignum* denoted a beam or structural member of a house. In its broader legal usage, the term encompassed all materials from which buildings were constructed — not merely timber in the modern sense, but any component of a building fabric. The Digest and Institutes of Justinian record the expansive interpretation: *appellatione tigni omnis materia significatur, ex qua aedificia fiunt* — "by the designation 'tignum,' all material out of which buildings are made is signified."
The term appears most frequently in Roman law in connection with the *actio de tigno iuncto* — the action available to an owner of building material that had been incorporated into another's structure — and the servitude known as *servitus tigni immittendi*, the right to insert a beam into a neighbor's wall.
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Common Language
Modern common usage (Wiktionary): No entry. The term does not appear in modern general English dictionaries and has no common English usage.
Historical common usage (Webster's 1913): No entry. The term remained confined to Latin legal and classical texts and was never naturalized into English usage.
Editorial note: *Tignum* is pure Latin legal terminology carried directly from Roman civil law into common law commentary without translation. Researchers encountering it in English-language sources are reading Roman law doctrine, not an English legal concept. The word "timber" in modern English covers only a subset of what *tignum* encompassed in its broader civil law sense.
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Why It Matters in Research
*Tignum* appears in early common law commentary — most notably Coke on Littleton — as a borrowing from Roman civil law. Researchers working in property law, easements, or the law of fixtures will encounter it in that context. The reference in Black's to *Co. Litt. 86a, 86b* is the primary English-language anchor: Coke used *tignum* when discussing the law of building materials, timber rights, and the relationship between structures and land.
Two specific research contexts matter most. First, the *actio de tigno iuncto*: Roman law denied the owner of wrongfully incorporated building material the right to remove it while the building stood, offering only a penal money action. This doctrine influenced early common law treatment of fixtures and annexed materials. Researchers tracing the historical foundations of fixture law may find *tignum* at the root of arguments about severability and the rights of material suppliers. Second, the servitude *servitus tigni immittendi* — the right to rest a beam in a neighbor's wall — is a canonical example of a predial servitude in civil law systems and appears in comparative property law discussions. American and English researchers encountering this servitude in Louisiana materials, Scottish sources, or civilian-influenced treatises will need *tignum* to follow the analysis.
A practical trap: researchers using full-text search in historical corpora may miss substantive discussions of timber rights or building material law because the operative term is Latin. Conversely, searching for "timber" in early sources will not retrieve passages where *tignum* is the operative word, even when both concepts are legally in play.
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Historical Dictionary Support
The three source dictionaries agree on the core definition but reflect different depths of engagement with the Roman sources. Black's (both editions) offers a minimal gloss — "building material; timber" — adequate for identification but insufficient for legal application. Burrill's is substantively more useful: it distinguishes the narrow sense (a beam, *trabs*) from the broad civil law sense encompassing all building materials, and it provides the Justinianic textual basis directly (*Inst.* 2.1.29; *Dig.* 50.16.62). The Latin dictionary entry confirms the etymology connects to the root *tek-* (craft, construction) and notes that *tignum* was a term of art in the Twelve Tables — the earliest stratum of Roman statutory law.
No historical dictionary fully explains the practical legal consequences of *tignum* classification. Burrill points toward *servitus tigni immittendi* but does not develop the *actio de tigno iuncto* or the fixture-law implications that give the term its relevance in common law research. For substantive doctrine, researchers must go to the primary Roman sources Burrill cites and to Coke's commentary.
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Jurisdictional Note
*Tignum* as an operative legal term is essentially extinct in American and English common law. It survives in legal history and comparative law scholarship, in Louisiana civil law materials (where Roman-derived property law doctrines retain relevance), and in academic discussions of easements and servitudes in mixed jurisdictions. Researchers in purely common law jurisdictions are unlikely to encounter it outside historical sources.
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