Definition
A Law French phrase meaning "it is to be understood" or "it is to be known" — rendered in modern English as "that is to wit" or "to wit." The phrase functions as an introductory signal in legal text, alerting the reader that what follows is a rule, definition, or authoritative principle. It does not create substantive legal rights or obligations; it is a structural marker indicating that an explanatory or doctrinal statement is about to be made.
The term is found almost exclusively in the works of Sir Thomas Littleton, particularly his Tenures, where it appears frequently at the opening of sections. Lord Coke, commenting on Littleton in Coke on Littleton, observed that the phrase "ever teacheth us some rule of law, or general or sure leading point" — meaning its appearance reliably signals a statement of legal doctrine rather than mere narrative or recitation of fact.
Common Language
Modern common usage (Wiktionary): "To wit" in modern English means "that is to say" or "namely" — used to introduce a clarification or specification of something just mentioned.
Historical common usage (Webster's 1913): "To wit" is defined as "that is to say; namely" — used to particularize or explain a general statement.
The gap between common and legal usage here is narrow in substance but significant in context. In ordinary English, "to wit" merely introduces a clarification. In Littleton's usage, est ascavoir carries additional weight: it signals not just a clarification but the statement of a governing legal rule or principle. A reader encountering the phrase in a historical legal source should treat what follows as carrying doctrinal authority, not merely descriptive elaboration.
Why It Matters in Research
Researchers working in Law French sources, particularly Littleton's Tenures and Coke's commentary upon it, will encounter est ascavoir repeatedly. Its significance is structural and interpretive: when Coke explains that the phrase signals "some rule of law, or general or sure leading point," he is giving readers a reading instruction. Passages introduced by est ascavoir in Littleton were understood by common lawyers of the sixteenth and seventeenth centuries as statement of principle, not illustration or example.
For corpus researchers, this matters in two ways. First, when indexing or analyzing pre-modern legal texts, est ascavoir can serve as a reliable marker for extracting doctrinal statements. Second, when tracing the development of a common law rule, the sections of Littleton introduced by this phrase are particularly likely to have been cited, argued over, and transmitted into later authority. Passages so introduced were treated as having special interpretive weight by subsequent commentators.
The phrase also illustrates the layered linguistic character of early English legal sources. Law French terms like est ascavoir were not merely decorative survivals; they carried conventional meaning understood by practitioners. Researchers unfamiliar with Law French conventions may misread such phrases as stylistic filler when they are in fact structural signals.
Because the phrase appears in a foundational text — Littleton's Tenures, which remained authoritative in English land law for centuries — its recurrence connects to virtually every major topic in early real property law. Researchers working on tenure, seisin, fee simple, fee tail, or copyhold should be alert to the sections of Littleton it introduces.
Historical Dictionary Support
Black's Law Dictionary (1st and 2nd editions) and Burrill's Law Dictionary are in complete agreement on the meaning and significance of this term. All three sources define it as "it is to be understood or known" and gloss it as equivalent to "it is to wit." All three cite the same sections of Littleton's Tenures (§§ 9, 45, 46, 57, 59) and reproduce the same observation from Coke on Littleton at folio 16.
The historical dictionaries are consistent but limited. None elaborates on the interpretive consequences of the phrase beyond quoting Coke's observation. None addresses how the phrase functions differently from similar introductory signals in Latin legal texts (such as sciendum est, its Latin near-equivalent, which Burrill's notes parenthetically). Researchers seeking fuller treatment of Law French as a technical legal register will need to go beyond the dictionary sources to works on the history of legal language.
Burrill's is the most linguistically attentive of the three, briefly noting the Latin parallel (sciendum est) alongside the Law French, which is a useful cross-reference for researchers working across both Latin and French legal sources of the medieval and early modern periods.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Law French; Littleton's Tenures; Coke on Littleton