Definition
The term BANK carries two distinct legal meanings that appear across the same historical sources and must be held apart in research.
1. Financial institution. A bank is an institution authorized to receive deposits of money, extend loans, and — in earlier usage — issue promissory notes intended to circulate as currency. Modern regulatory definitions refine this core further: a bank is typically an entity chartered under federal or state authority, subject to ongoing supervision, and (in the United States) eligible for deposit insurance through the Federal Deposit Insurance Corporation. The term encompasses commercial banks, savings banks, and savings associations, though regulatory distinctions among these matter considerably for compliance and chartering purposes.
2. Bench or court (archaic). In older English legal usage, bank (or more commonly its variant banc) referred to the bench occupied by judges and, by extension, to the full court sitting together. A "sitting in bank" meant all judges of a court assembled to hear arguments — on demurrers, reserved points, or motions for new trial — as distinguished from a single judge sitting at nisi prius or at assizes. This usage survives principally in the phrase in banc (or en banc), still used today when an appellate court convenes with its full complement of judges.
Common Language
Modern common usage (Wiktionary): An institution where one can place and borrow money and take care of financial affairs; a branch of such an institution; also, the fund held by a dealer in a card game.
Historical common usage (Webster's 1913): A mound, pile, or ridge of earth raised above the surrounding level; the margin of a watercourse; the rising ground bordering a lake, river, or sea.
The physical-geography sense (riverbank, snowbank) is entirely separate from both legal meanings and creates no doctrinal confusion. The card-game sense — the dealer's fund or stake — is worth noting because early legal definitions of the financial-institution meaning drew on precisely this idea of a pooled fund held for lending and exchange. The gap that matters for researchers is the archived judicial meaning: encountering "bank" in an older English report or pleading may signal a court, not a counting house.
Common Confusion
The two legal meanings of BANK — financial institution and bench/court — can produce misreadings in historical case law and treatise text. A reference to "the bank" in an older English report may be a reference to the court sitting in full session, not to a commercial institution. The variant spellings banc and banco are more consistently used for the judicial sense in later sources, but early materials are not uniform. Researchers working in pre-nineteenth-century English legal sources should resolve ambiguity from context before assuming the financial meaning.
The financial-institution meaning is itself not uniform across regulatory regimes. A "bank" under the National Bank Act, a "bank" under the Bank Holding Company Act, and a "bank" under state chartering statutes are not coextensive categories. Entities that receive deposits but are chartered under different frameworks (thrifts, credit unions, industrial loan companies) may or may not qualify as "banks" for a given statutory purpose.
Recognized Forms
/SUBTYPES
National bank: Chartered under federal law (National Bank Act), supervised by the Office of the Comptroller of the Currency, and authorized to operate across state lines.
State bank: Chartered under the law of an individual state, supervised by that state's banking authority, and — if a member of the Federal Reserve System — also subject to Federal Reserve oversight.
Savings bank / savings association: Historically focused on consumer deposits and mortgage lending; subject to distinct chartering and supervisory frameworks.
Central bank: A government or quasi-governmental institution (in the United States, the Federal Reserve System) that controls monetary policy, serves as lender of last resort, and oversees payment systems. Not a commercial bank in the ordinary sense.
Why It Matters in Research
The judicial meaning is a live trap. Researchers reading English common-law materials from the seventeenth through nineteenth centuries will encounter "bank" and "sitting in bank" in procedural contexts. Misreading these as financial references distorts the record. The en banc usage has survived into modern American appellate procedure, so the thread is unbroken — but the older spelling variants and the fuller procedural context they described are documented primarily in historical sources.
For financial-institution research, the critical navigational point is regulatory fragmentation. The Law Mind corpus contains materials spanning the era before federal deposit insurance (pre-1933), the New Deal restructuring of the banking system, and the post-2008 period of Dodd-Frank reform. Definitions of "bank" shift across these periods, and a statutory definition operative in one era may not carry forward. Early corpus sources that define a bank primarily by its note-issuing function are describing a pre-Federal Reserve world; the power to issue circulating notes ceased to be the defining characteristic after the Federal Reserve took over that function.
Jurisdictional variation in chartering standards, permissible activities, and branching rules means that a statement about what a bank "may" do drawn from one source may be jurisdiction-specific and time-specific. The dual banking system — parallel federal and state chartering tracks — is a persistent structural feature that creates genuinely different legal regimes for institutions that may look identical from the outside.
Researchers connecting to fintech and digital banking materials should be alert to the question of whether a given digital financial entity meets the legal definition of a bank at all. Much of the regulatory literature in this area turns on exactly that threshold question.
Historical Dictionary Support
The historical dictionaries converge on the financial-institution meaning: Burrill defines a bank as "a company or association of persons, authorized to receive deposits of money, to lend money, and to issue promissory notes intended for circulation as money," and locates the etymology in the Latin bancus (a bench or counter used by dealers in money). Black's (both editions) leads with the judicial meaning — bench, tribunal, full court — before turning to the financial institution. This ordering reflects the dictionaries' grounding in common-law procedure, where the judicial sense was primary for practicing lawyers consulting a legal dictionary.
Burrill is the most complete on the financial side, and is also the only source among those surveyed to record a third, physical meaning — "land, usually of some elevation, along the side of a river or stream" — reflecting the term's use in property and water-law contexts (riparian boundaries, floodplain descriptions). This meaning does not appear in the other legal dictionary sources but surfaces in Webster's 1913 as the primary common definition.
What the historical dictionaries largely miss is the regulatory architecture that would come to define the term legally in the twentieth century: deposit insurance, reserve requirements, chartering distinctions, and the separation of commercial from investment banking. These developments are not in scope for nineteenth-century sources and must be tracked through statutory and regulatory materials.
Jurisdictional Note
In the United States, the dual banking system means that "bank" can refer to a federally chartered national bank or a state-chartered institution, each operating under a distinct but overlapping supervisory framework. Outside the United States, the term is similarly regulated but under entirely different statutory schemes; European Union materials, for example, use "credit institution" as the governing regulatory category, which does not map cleanly onto the U.S. definition of bank.
Encyclopedia Cross-Reference
Banking — National Bank Act, Federal Reserve Act, and the Dual Banking System (The Law Mind Business Organizations & Corporate Law Encyclopedia)
Banking — FDIC Insurance and Bank Failure Resolution (The Law Mind Business Organizations & Corporate Law Encyclopedia)
Banking — Fintech Regulation and Digital Banking (The Law Mind Business Organizations & Corporate Law Encyclopedia)