Definition
Latin: "Let it be printed." An imprimatur is an official authorization or license to print and publish a written work, historically issued by a governmental or ecclesiastical authority. Without this approval, publication was legally prohibited.
In legal usage, the term carries two senses:
1. Historical censorship license. A formal written permission, granted by a competent authority, allowing a book, pamphlet, or other document to be printed. In England, this requirement arose from early press regulation statutes and persisted in various forms through the seventeenth century. The word itself — imprimatur — was the operative term inscribed on the work to signal that approval had been granted.
2. Modern figurative usage. In contemporary legal writing and judicial opinions, imprimatur appears as a term of art meaning official endorsement, sanction, or approval by a government body or court. It does not connote a licensing regime in this usage; it signals that the authority of the state or institution stands behind something.
Common Language
Modern common usage (Wiktionary): An official license to publish or print something, especially when censorship applies; also, any mark of official approval.
Historical common usage (Webster's 1913): A license to print or publish a book, paper, etc.; also, in countries subjected to the censorship of the press, approval of that which is published.
The gap between common and legal usage is narrow for the historical sense but meaningful in modern legal writing. When courts and legal scholars deploy imprimatur today, they rarely mean a publishing license — they mean that government approval or state authority has been attached to an act or practice. A researcher encountering the word in a First Amendment or Establishment Clause context should not read it as a reference to print censorship; it signals constitutional concern about government endorsement itself.
Common Confusion
Imprimatur is sometimes conflated with nihil obstat, its ecclesiastical companion term. In Catholic canon law usage, nihil obstat ("nothing hinders") was the preliminary clearance issued by a censor, while imprimatur was the bishop's formal authorization that followed. Legal and historical sources occasionally use the terms interchangeably, but they represent sequential steps in the approval process, not synonyms. Secular legal sources generally ignore nihil obstat entirely and use imprimatur alone to mean any official approval.
Why It Matters in Research
The term operates in two largely separate documentary streams, and conflating them produces research errors.
First stream — press regulation history. Researchers working in English legal history before 1700 will encounter imprimatur as a live legal requirement. Burrill correctly traces the origin to the Acts of Uniformity and early press control statutes. The Licensing of the Press Act 1662 (14 Car. II c. 33) is the central document; its lapse in 1695 effectively ended mandatory imprimatur in England. Sources from this period use imprimatur as a technical term with specific procedural content. Black's 2nd edition notes that some other countries retained the requirement — a useful caution for researchers in comparative or civil law sources.
Second stream — modern constitutional law. In U.S. constitutional litigation, particularly under the First Amendment's Establishment Clause and Free Speech Clause, imprimatur appears frequently in judicial opinions as a rhetorical and analytical marker. When a court writes that a government practice places the state's "imprimatur" on a religious message or a particular viewpoint, it is invoking the endorsement test and signaling potential constitutional invalidity. Researchers using corpus search tools should be alert to this bifurcation: a hit on imprimatur in a twentieth- or twenty-first-century document almost certainly belongs to the constitutional endorsement context, not the historical licensing context.
Jurisdictional variation in the historical record matters too. The English licensing requirement had no direct American colonial analogue after independence, and American law never institutionalized a general imprimatur system. Researchers should not assume that English sources on imprimatur translate into American legal practice.
Historical Dictionary Support
Black's 1st and 2nd editions are consistent and accurate on the core definition, with the 2nd edition adding the useful comparative note about other countries retaining the requirement. Both are brief and descriptive rather than analytical.
Burrill provides the most historically grounded entry of the shelf sources, correctly identifying the Acts of Uniformity as the origin point and noting the early printers' practice of operating without license. The citation to Yorke's argument in 1 W. Bl. 114 is a genuine historical reference, though researchers should verify the specific passage independently.
The Bouvier's entry in the source material is corrupted — the text provided concerns impotency (impuissance) rather than imprimatur, likely a scanning or pagination error in the digitized source. Researchers relying on Bouvier for this term should locate a clean edition; Bouvier's dictionary does address imprimatur, but the entry is not usable from the version reproduced here. This is a concrete example of why corpus researchers should cross-check digitized historical sources against physical editions when entries appear anomalous.
None of the historical dictionaries address the modern constitutional usage of the term, which has become its dominant appearance in American legal writing. For that dimension, the dictionaries are silent and researchers must look to case law and First Amendment scholarship directly.
Jurisdictional Note
The historical imprimatur requirement was an English statutory creation that lapsed in 1695 and was never replicated as a general legal institution in the United States. Modern American usage is almost entirely confined to constitutional law rhetoric. Civil law jurisdictions and some common law countries with ongoing press regulation statutes may retain administrative licensing analogues, but these are typically not called imprimatur in their domestic law.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Freedom of the Press (historical development); Establishment Clause (endorsement test).