Definition
Coining is the sovereign act of casting or stamping metal of intrinsic value into a standardized form and impressing upon it a designated denomination, thereby creating lawful currency. The act encompasses not only the physical manufacture of coin but the exercise of governmental authority to declare and guarantee the coin's value for circulation.
In U.S. constitutional law, the power to coin money belongs exclusively to Congress. No state may coin money, and no private party may lawfully manufacture coins intended to circulate as currency without federal authorization. The flip side of this power — the prohibition against counterfeiting — is closely related: unauthorized coining, or the fraudulent making of coins resembling lawful currency, constitutes a federal crime.
Common Language
Modern common usage (Wiktionary): Present participle and gerund of "coin" — in ordinary speech, "coining" most often means inventing or originating something, particularly a new word or phrase (as in "coining a term").
Historical common usage (Webster's 1913): To fabricate; to make; to invent; to originate — as well as to make coins by stamping metal.
The gap is significant. In everyday English, "coining" has almost entirely shed its monetary meaning in favor of the metaphor of invention. In law, "coining" retains its original, literal sense — the manufacture of metallic currency — and carries with it the full weight of sovereign monetary authority. A researcher encountering "coining" in a legal text should not read it as a general term for creation or invention.
Common Confusion
Coining is sometimes conflated with counterfeiting, but the two concepts are legally distinct. Coining, in its lawful sense, is the authorized manufacture of currency by the sovereign power. Counterfeiting is the unauthorized manufacture of coins (or notes) made to resemble lawful currency with intent to deceive. The confusion arises because both involve physically producing coin-like objects; the distinction lies entirely in authorization and intent. Older legal texts occasionally use "coining" as shorthand for the criminal offense — meaning illicit coining — which can mislead researchers expecting the term to carry only its neutral, sovereign meaning.
Why It Matters in Research
The primary research trap is the term's dual valence. In constitutional and governmental law sources, "coining" is value-neutral — it describes the legitimate exercise of monetary power. In criminal law sources, particularly older English materials, "coining" frequently refers to the offense of making counterfeit coin, treated as a species of treason or serious felony. A researcher moving between constitutional law and criminal law collections must read "coining" in context to determine which meaning governs.
Historical English law treated coining (as a criminal act) with extraordinary severity — it was classed as high treason under English statute for centuries. American sources largely decriminalize the word itself by reserving it for the sovereign function, but older American criminal treatises influenced by English practice may still use "coining" to mean the offense. Researchers working in pre-twentieth-century American criminal law materials should be alert to this carryover.
The constitutional dimension is a persistent research anchor. The Coinage Clause (U.S. Const. Art. I, § 8, cl. 5) grants Congress power "to coin money, regulate the value thereof." The companion prohibition in Art. I, § 10 bars states from coining money. Any research touching on monetary sovereignty, legal tender, or the limits of state economic power will eventually return to the coining power as a reference point.
There is also a practical connection to the Law Mind corpus entries on counterfeiting and on the history of American monetary regulation. The line between coining as sovereign right and coining as criminal usurpation of that right is one of the organizing tensions in the development of U.S. monetary law.
Historical Dictionary Support
Bouvier's is the primary source here, and its entry is brief but precise. It defines coining as the process of molding metal of intrinsic value and stamping its legal value upon it, with the purpose of facilitating circulation and ensuring currency stability. Bouvier cites Wharton for the proposition that coining is universally an act of sovereign power, and references the U.S. Constitution directly for the exclusive congressional grant.
What Bouvier does not address is the criminal law dimension — the offense of illicit coining — which was extensively treated in English legal authorities and in Wharton's own criminal law treatise. Researchers relying solely on Bouvier's entry will have a sound constitutional picture but an incomplete criminal law picture. Wharton's Criminal Law, which Bouvier references elsewhere, fills this gap and should be consulted in tandem for any research touching on coining as an offense.
No major historical dictionary diverges from Bouvier's constitutional framing; the proposition that coining is a sovereign act is uncontested across the legal dictionary literature.
Jurisdictional Note
In the United States, the coining power is exclusively federal. States are constitutionally prohibited from coining money, a restriction that has been consistently enforced and that has no meaningful exception. This makes U.S. jurisdictional variation essentially nonexistent on the constitutional question, though state criminal codes may independently address the possession or passing of counterfeit coin.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Currency and Monetary Powers (for the constitutional framework of the coining power and its limits); Counterfeiting (for the criminal law dimension and the offense of illicit coining).