Definition
In Scots law, a bond that includes a penalty clause, as distinguished from a single bond, which contains no such penalty. The double bond obligates the debtor to pay a specified sum upon default, with an additional punitive or liquidated amount — the penalty — attached to enforce compliance. The penalty provision is the defining feature: it imposes a consequence beyond the principal obligation, functioning as a pressure mechanism on the obligor to perform.
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Common Language
Modern common usage (Wiktionary): A covalent bond in which two electron pairs are shared between two atoms; a concept from chemistry most commonly encountered in organic molecules involving carbon, oxygen, or nitrogen.
Historical common usage (Webster's 1913): No distinct entry for "double bond" as a compound term; "bond" in common use referred generally to any tie, fastening, or obligation between persons.
The gap here is complete. A researcher encountering "double bond" in a legal source will find no meaningful connection to the chemical or everyday sense of the term. The legal meaning is confined to Scots law and refers entirely to the structure of a debt instrument, not to molecular chemistry or informal obligation.
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Common Confusion
The most likely confusion is between the double bond and the penal bond, which is a closely related instrument found in English and American law. A penal bond similarly pairs a principal obligation with a penalty sum — historically the classic form was a bond in double the principal amount, payable upon breach. The Scots usage of "double bond" maps closely onto this concept but is a distinct term of art within Scottish legal practice. Researchers working in English common law sources will rarely encounter "double bond" as a term; they will instead find "penal bond," "bond with condition," or "bond and penalty." Conflating these across legal systems will produce anachronistic or jurisdictionally incorrect readings.
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Why It Matters in Research
This is a narrow Scots law term with a very limited footprint in the Law Mind corpus. Researchers should note several traps:
First, the term appears almost exclusively in Scottish legal materials and in comparative or historical English treatises that discuss Scottish practice. It is not standard English common law vocabulary and will not appear reliably in English case reporters or American sources.
Second, both Black's and Burrill's anchor the definition to a single citation — Kames' Equity — which means the historical record for this term is thin. Any corpus search that returns "double bond" in non-Scottish legal materials should be treated with suspicion; the phrase may be used loosely or in an entirely different sense.
Third, researchers interested in penalty clauses and bond structure more broadly should work outward from this term into the adjacent literature on penal bonds, single bonds, and the law of suretyship. The double bond is a species within that larger genus, and understanding its context requires familiarity with how Scots law treated penalty enforcement differently from English equity, which by the late seventeenth century was actively relieving against penalties.
Fourth, do not allow the chemistry sense of "double bond" to create false positives in corpus searches. Filtering by legal subject matter and date range will be essential.
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Historical Dictionary Support
Black's Law Dictionary and Burrill's Law Dictionary are in full agreement on this term — indeed, their entries are nearly verbatim identical, both citing Kames' Equity at page 359. This convergence reflects that both compilers drew from the same narrow Scottish legal authority rather than from independent streams of analysis. Neither entry elaborates on the mechanism of the penalty, the enforceability rules, or the historical relationship to English penal bonds. Neither flags how Scottish courts approached relief from penalties compared to English equity courts.
What the historical dictionaries miss: The practical significance of the double bond lies in the enforcement question — whether a creditor could recover the full penalty or only actual damages. Scots law and English equity diverged on this, with English chancery courts moving toward relief against penalties from the late seventeenth century onward. Historical dictionaries treating this term do not address that tension, leaving the researcher without context for why the distinction between a single bond and a double bond mattered in practice.
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Jurisdictional Note
This term is specific to Scots law. It does not appear as a term of art in English common law, American law, or other common law jurisdictions. Researchers working in Scottish legal history or comparative law contexts will find it meaningful; those working in English or American sources should instead look to "penal bond" as the functional equivalent.
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Encyclopedia Cross-Reference
Suretyship — Performance Bonds and Payment Bonds (Construction Context), The Law Mind Contracts & Commercial Law Encyclopedia. The double bond's structural logic — a principal obligation paired with a penalty — is the historical ancestor of modern bond instruments. This encyclopedia entry provides the contemporary framework into which the double bond's historical function fits.
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