Definition
Per proc (also written per pro, p.p., or per procurationem) is a Latin abbreviation meaning "by procuration" or "through the agency of another." It appears most commonly on signed documents — particularly bills of exchange, promissory notes, and formal correspondence — to indicate that the person signing is doing so as an agent on behalf of a principal, not in their own right.
When a signature is prefixed with per proc, it signals that the signatory holds only a limited or delegated authority. The legal effect is significant: the notation operates as constructive notice to any person dealing with the document that the agent's authority to bind the principal may be restricted. The principal is bound only to the extent the agent acted within the actual limits of the authority conferred. If the agent exceeded that authority, the principal is not liable, and the third party cannot claim ignorance of the limitation — the per proc notation was their warning.
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Common Language
This is pure legal and commercial Latin shorthand with no meaningful counterpart in everyday English. The phrase "by procuration" is itself a term of art. Common usage of the word "procuration" (if used at all) tends loosely to mean obtaining or procuring something. The legal meaning — a formal grant of agency authority — is narrower and more specific. Omitting further common-language comparison is warranted here.
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Common Confusion
Per proc is sometimes confused with general agency signatures or with signing "on behalf of" a principal without qualification. The distinction matters: a simple "for and on behalf of" signature does not, by itself, carry the same notice function. Per proc specifically signals limited authority. A third party who sees a per proc notation and proceeds without inquiring into the scope of the agent's authority cannot later claim the principal should be bound beyond that scope. By contrast, an apparently authorized agent signing without limitation may, under the doctrine of apparent authority, bind the principal more broadly.
Per proc should also be distinguished from per se, per quod, and other Latin per constructions common in legal writing. Per quod, for instance, is a pleading term introducing a legal consequence from stated facts — unrelated to agency or signature authority.
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Why It Matters in Research
Researchers working with historical commercial law materials — particularly cases involving bills of exchange, negotiable instruments, or mercantile agency from the 18th and 19th centuries — will encounter per proc frequently. Its significance in that era was substantial: the negotiable instruments trade depended on clear signals of authority, and the per proc notation was a standard commercial mechanism for managing risk when agents signed on behalf of principals.
Several navigational cautions apply:
First, the abbreviation appears in multiple forms across sources: per proc, per pro, p.p., and per procurationem in full. Search strategies in historical corpora should account for all variants.
Second, the legal effect of the notation — constructive notice of limited authority — has been absorbed into modern agency and negotiable instruments law without the Latin label surviving in statutes. Researchers tracing doctrine into modern sources should look to negotiable instruments law (particularly UCC Article 3 in the United States) and general agency principles rather than searching for the Latin term itself.
Third, the notation persists in British commercial and correspondence practice longer than in American usage. Researchers in Commonwealth legal materials will encounter it more frequently than those working primarily in post-UCC American sources.
Fourth, the per proc notation raises questions that connect to broader agency doctrine: Was authority actually granted? What were its limits? Did the third party have notice? These questions thread through a wide range of cases even where the per proc label is not used.
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Historical Dictionary Support
Bouvier's is the primary historical dictionary source here, and its treatment is compact but precise. Bouvier correctly identifies per proc as "by procuration; by letter of attorney" and makes the critical point that the notation does not by itself establish that a formal procuration exists — only that the signer is acting in a representative capacity. The binding effect on the principal depends on whether the agent stayed within actual authority. This is consistent with mainstream 19th-century commercial law treatment of agency signatures on negotiable instruments.
Bouvier's citation to 27 L.J. Ex. 468 and 3 H. & W. 554 points to English Exchequer-era authority, reflecting the doctrine's roots in English mercantile practice. Historical dictionaries beyond Bouvier's do not provide independent entries of note for this term; it was treated as a term of commercial art rather than a general legal concept requiring extended definition.
What historical sources understandably do not address is the term's eventual absorption and transformation under codified negotiable instruments law — first through the Uniform Negotiable Instruments Law and then the UCC — where the functional doctrine survived but the Latin shorthand did not.
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Jurisdictional Note
The per proc notation and its notice effect originated in English commercial law and carried over into American practice through the common law of negotiable instruments. In modern U.S. practice, UCC Article 3 governs the effect of representative signatures on negotiable instruments and addresses authority questions without using the Latin term. In British and Commonwealth commercial practice, per proc (or p.p.) remains a recognizable and used notation in correspondence and formal documents.
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