Definition
In legal usage, SURE denotes a standard of weight or measure established and fixed by law, to which all other weights and measures within a jurisdiction must conform. It is the authoritative reference unit — the legal benchmark against which commercial and official measurement is tested and regulated.
This meaning is largely obsolete in modern legal writing, where terms such as "standard," "legal measure," or "authorized unit" have displaced it. Burrill records the term in this technical sense, citing Blackstone's Commentaries (1 Bl. Com. 274–276) as authority for the proposition that lawful commerce and administration depend on a fixed, legally prescribed measure from which no deviation is permitted.
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Common Language
Modern common usage (Wiktionary): Certain in knowledge or belief; reliable; physically secure; free from danger; also, betrothed or engaged.
Historical common usage (Webster's 1913): Certainly knowing and believing; confident beyond doubt; implicitly trusting; unquestioning; positive; fit or worthy to be depended on.
The gap between common and legal meaning here is sharp and historically significant. In ordinary English — both modern and nineteenth-century — "sure" is an adjective describing a state of mind (certainty, confidence) or a condition of physical security. In Burrill's legal usage, it is a noun denoting a concrete physical object or legal institution: the prescribed standard of measurement itself. A researcher encountering "sure" in an older legal text should not read it as a modifier expressing certainty, but as a reference to the legally authorized unit of weight or measure in force at the relevant time and place.
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Common Confusion
SURE vs. STANDARD: In modern regulatory and commercial law, "standard" performs the function Burrill assigns to "sure." Researchers should treat the two as functionally equivalent when reading historical sources, while recognizing that "standard" carries additional modern meanings (standard of care, evidentiary standard, etc.) that "sure" never bore.
SURE vs. SURETY: The visual and phonetic similarity to SURETY — a guarantee or the person who guarantees another's obligation — creates a real risk of misreading in manuscript or abbreviated sources. The two terms are etymologically related through a common root in the Latin securus, but their legal meanings are entirely distinct. SURETY concerns obligations and guarantee; SURE (in this legal sense) concerns physical measurement and regulatory compliance.
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Why It Matters in Research
Researchers working in pre-modern commercial law, market regulation, or administrative history will encounter "sure" in statutes, assize records, and treatises governing the regulation of trade. The Assize of Bread and Ale, guild regulations, and early mercantile statutes in the English tradition all operated against a background of legally prescribed weights and measures — the "sure" — from which deviation constituted a criminal or civil wrong.
Because the term has fallen entirely out of modern legal vocabulary, full-text searches for "sure" in historical corpora will return enormous noise: every ordinary use of the word as an adjective of certainty will surface alongside the rare technical usage. Researchers should anchor searches to surrounding context — proximity to "weight," "measure," "assize," "bushel," "ell," or similar terms of quantification — rather than relying on the term alone.
Jurisdictional variation in historical weights and measures was substantial. The "sure" in one county or borough might differ from the royal or parliamentary standard, and disputes over which measure controlled were a recurring source of litigation. When reading Blackstone's treatment (cited by Burrill), note that he addresses the parliamentary effort to impose national uniformity — a project that was incomplete for much of the period researchers are likely to study.
The term does not appear in most modern legal dictionaries, which means researchers relying solely on contemporary reference works will find no guidance. Burrill is currently the primary surviving dictionary source for this usage in Law Mind's corpus.
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Historical Dictionary Support
Burrill's Law Dictionary provides the sole dictionary entry in the Law Mind corpus for this term in its legal sense. Burrill defines it concisely as "a weight or measure fixed and prescribed by law, to which all other weights and measures are required to correspond," and anchors the definition in Blackstone's Commentaries, Book I, pages 274–276 — Blackstone's discussion of the regulation of weights, measures, and money as fundamental exercises of parliamentary authority.
No divergence or competing definition is available from other historical dictionaries in the corpus. The absence of the term from later legal dictionaries (Black's, Bouvier's) suggests it had largely passed out of active legal vocabulary by the mid-nineteenth century, absorbed into the broader statutory language of weights and measures legislation on both sides of the Atlantic.
Researchers should treat Burrill's entry as authoritative for the period it covers while remaining alert to the possibility that local or regional usage may have varied in ways that Burrill's summary definition does not capture.
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Jurisdictional Note
The legal concept Burrill describes was operative principally in English and early American law. In the United States, constitutional authority over weights and measures is vested in Congress (U.S. Const. art. I, § 8), but implementation has always been largely statutory and administrative. English historical usage, from which American law derived, was shaped by successive parliamentary assizes and standards legislation. Researchers working in Scottish, Irish, or colonial sources should verify which standard — local, royal, or parliamentary — governed at the relevant time.
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Weights and Measures; Standards of Measurement; Assize (historical regulation of trade)
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