Definition
In the civil law, inductio is the obliteration of written text by drawing a pen or stylus across it. The term describes a physical act of cancellation — running an instrument over a writing to render it void or annulled. It appears most prominently in the law of wills, where the deliberate obliteration of a testamentary document or a portion of it could affect the document's validity or revoke its provisions.
Common Confusion
Inductio is sometimes loosely associated with cancellation, interlineation, or erasure, but the terms describe distinct physical acts. Inductio specifically refers to drawing over existing text — a linear stroke of the stylus — as distinguished from erasure (physical removal of material), interlineation (insertion of new text between existing lines), or deletion by other means. In assessing whether a will was effectively altered or revoked, the precise nature of the physical act mattered under Roman and civil law doctrine, making these distinctions legally consequential rather than merely semantic.
Why It Matters in Research
Inductio is a term of Roman and civil law origin with no meaningful modern common-law equivalent as a standalone doctrine. Researchers are most likely to encounter it in three contexts:
First, in historical treatises and digests on testamentary law, particularly in discussions of will revocation and alteration. The Digest citation (Dig. 28, 4) places inductio squarely within Roman rules governing the cancellation of wills, and researchers working in that portion of the Digest or in commentary upon it will find the term used precisely.
Second, in early American and English legal dictionaries and encyclopedias that drew heavily on civil law sources. When common-law courts or treatise writers engaged with questions of will obliteration or cancellation, they sometimes borrowed Roman terminology, and inductio appears in that borrowing tradition.
Third, in Louisiana law and other jurisdictions with civil law foundations, where Roman-derived concepts of testamentary cancellation had longer doctrinal lives than in purely common-law states. Researchers working in those bodies of law should be alert to this term appearing in older cases and notarial practice materials.
A navigational trap: the English word "induction" carries entirely different meaning (logical inference; introduction to office), and keyword searches in digitized corpora that do not discriminate by language or legal context will surface large volumes of irrelevant material. Searching inductio as a Latin term, or in combination with testamentary or civil law context markers, will substantially improve precision.
Historical Dictionary Support
The four source dictionaries agree precisely and completely on the definition: inductio means obliteration by drawing the pen or stylus over writing. All four cite Digest 28, 4 as the primary authority, and three also reference Calvin's Lexicon Iuridicum (Calv. Lex. or Calvin.), a standard early modern Latin legal dictionary. The consistency across sources reflects that this is a narrow, technically stable term — there is no documented evolution or dispute in the dictionary record.
Burrill adds the etymological anchor, tracing inductio to inducere (to draw along, or over), which usefully distinguishes this term from induction in its logical sense (from another Latin root tradition). No source in the Law Mind corpus offers substantive elaboration beyond the core definition and Digest citation, suggesting that the term's practical significance in English-language legal discourse was largely confined to its use as a reference point rather than as active doctrine.
What the historical dictionaries do not address: they say nothing about how inductio interacted with questions of animus revocandi (intent to revoke), which Roman and later civil law required alongside the physical act to achieve testamentary revocation. Researchers should not assume that the physical act alone, as described in these entries, was legally sufficient without consulting the underlying Digest title and commentary.
Jurisdictional Note
Inductio as a distinct legal term has essentially no operative role in modern American common law. Its relevance is historical and civil-law specific. Researchers in Louisiana, Quebec, or other jurisdictions with Roman-law foundations may find the concept more directly relevant to older sources, though modern civil codes address will revocation through updated statutory frameworks.