Definition
A slip of paper physically annexed to a negotiable instrument — such as a bill of exchange, promissory note, or check — to receive endorsements when the original instrument has no remaining blank space for them. Once affixed, the allonge becomes part of the instrument itself and endorsements written on it carry the same legal force as those written on the instrument directly.
The allonge is a mechanical solution to a practical problem: negotiable instruments change hands repeatedly, and each transfer ordinarily requires an endorsement. When the reverse of the instrument fills up, the allonge provides additional writing surface without creating a new or separate document.
Common Language
Modern common usage (Wiktionary): "A slip of paper attached to a negotiable instrument to hold endorsements should the document itself be unable to hold any more." Also, separately: "A thrust or pass; a lunge."
Historical common usage (Webster's 1913): "A thrust or pass; a lunge. A slip of paper attached to a bill of exchange for receiving indorsements, when the back of the bill itself is already full."
The fencing and swordsmanship meaning — a lunge or pass — shares only French etymology with the legal term and has no overlap in meaning or legal relevance. A researcher encountering allonge in a general 19th-century text should determine from context whether the author is discussing commercial paper or combat. In legal sources, the instrument meaning is universal.
Common Confusion
Allonge is sometimes loosely conflated with a simple attachment or addendum to a contract. The distinction matters: an allonge is specifically tied to negotiable instruments and the law governing endorsements. A rider or addendum to a contract is governed by contract law, not negotiable instruments law, and does not carry the endorsement-validity rules that apply to allonges. The terms are not interchangeable.
Why It Matters in Research
The allonge appears most frequently in commercial law disputes over the validity of endorsements and chain-of-title in negotiated instruments. Two research traps stand out.
First, the threshold question — when an allonge is permissible — has shifted. Historically, courts required that the instrument itself be physically full before an allonge could be used; an endorsement on an allonge when space remained on the instrument was sometimes held invalid. Modern Article 3 of the Uniform Commercial Code relaxes this requirement, making the historical case law unreliable as a guide to current practice. Researchers moving between pre-UCC and post-UCC sources need to flag this shift explicitly.
Second, the attachment requirement is non-trivial. Courts have invalidated endorsements on slips of paper that were not firmly affixed to the underlying instrument at the time of endorsement. This matters in mortgage securitization litigation, where the validity of endorsements on allonges became heavily contested after 2008 — producing a large body of case law that does not appear in any of the historical dictionaries.
The corpus will surface allonge most frequently in: (1) negotiable instruments treatises; (2) commercial law digests organized under bills of exchange or notes; (3) post-2008 foreclosure and mortgage assignment materials. Connections run directly to endorsement, negotiation, holder in due course, and chain of title.
Historical Dictionary Support
The four source dictionaries are in close agreement on the core definition, reflecting the settled commercial law understanding of the 19th and early 20th centuries. All four identify the allonge as a paper annexed to a bill or note to receive further endorsements when the original is full, and all treat it as becoming part of the instrument upon annexation.
Rapalje & Lawrence adds the most useful historical texture, tracing the word to the French allonger (to lengthen) and citing Byles on Bills — the leading English treatise on negotiable instruments — as authority. The citation to 18 Pick. (Mass.) 63 grounds the concept in early American case law.
Anderson's Dictionary begins to address the threshold question — noting that use of an allonge does not require a strict physical impossibility of writing on the original — which anticipates later doctrinal softening, though the entry appears to be truncated in surviving sources.
The second edition of Black's entry included in the source material is misattributed; the text reproduced there describes allocato comitatu, an entirely unrelated term from outlawry procedure. Researchers encountering that edition should treat the allonge entry as found in the first edition only, and verify page references carefully.
None of the historical dictionaries address the UCC treatment, securitization contexts, or attachment disputes — the areas where allonge generates the most modern litigation. For those questions, the historical shelf is a starting point only.
Jurisdictional Note
UCC Article 3, adopted in substantially uniform form across U.S. jurisdictions, governs allonges in American commercial practice. Pre-UCC common law rules — particularly stricter requirements that the instrument be physically full before an allonge could be used — may still be relevant in jurisdictions with delayed or non-uniform UCC adoption, and in disputes governed by the law of non-UCC jurisdictions. English and Commonwealth practice follows bills of exchange legislation rather than the UCC.