Definition
In law, tricycle has no independent legal meaning of its own. Anderson's Dictionary of Law directs readers simply to "see BICYCLE," treating the tricycle as a subordinate vehicle category governed by whatever statutory or regulatory framework applies to bicycles in a given jurisdiction. As a legal term, tricycle refers to a three-wheeled human-powered (or, in modern usage, motorized) vehicle, and its legal significance arises entirely from how legislatures and courts classify it within broader vehicle or traffic codes—whether as a bicycle, a vehicle, or a distinct category.
Common Language
Modern common usage (Wiktionary): To ride a tricycle; by extension, a three-wheeled pedal-powered vehicle, especially one associated with children.
Historical common usage (Webster's 1913): "A three-wheeled velocipede."
The gap between common and legal meaning here is less about definition and more about classification. In ordinary English, a tricycle is simply a familiar object. In law, the question is never what a tricycle is, but what category it belongs to—and that classification carries real consequences for licensing, liability, road access, and equipment requirements.
Why It Matters in Research
The Anderson entry's terse cross-reference to BICYCLE is itself the most instructive data point for researchers. It signals that tricycle was not, at the time of publication, a term carrying independent legal freight—the law's treatment of three-wheeled vehicles piggybacked entirely on whatever bicycle law existed in a given jurisdiction.
Researchers should be alert to several traps in historical and modern sources:
First, classification problems compound over time. The velocipede-era statutes that Anderson's dictionary reflects were written before motorized tricycles, cargo trikes, recumbent tricycles, and mobility-device trikes existed. A researcher applying a late 19th-century "bicycle" ordinance to a modern electric tricycle faces a classification gap that the historical sources cannot resolve.
Second, modern vehicle codes often treat tricycles inconsistently. Some jurisdictions define "bicycle" to include any human-powered cycle with two or more wheels, sweeping tricycles in. Others enumerate tricycles separately, or carve out motorized three-wheelers as mopeds, motorcycles, or low-speed vehicles. The research path is therefore: find the controlling jurisdiction's vehicle code definitions, not the common-law meaning.
Third, the mobility device context is increasingly significant. Three-wheeled electric mobility scooters occupy a contested space between wheelchair, bicycle, and motor vehicle in ADA compliance, sidewalk access, and traffic law. Historical dictionary sources are silent on this, and researchers should not rely on them here.
Fourth, product liability and personal injury research involving tricycles will typically turn on vehicle safety standards (CPSC regulations for children's tricycles; NHTSA frameworks for motorized versions) rather than on any common-law definition of the term.
Historical Dictionary Support
Anderson's Dictionary of Law offers only a redirect: "See BICYCLE." This is informative in what it omits. The entry reflects a late 19th-century legal world in which the tricycle was recognized as a road vehicle—indeed, tricycles were common adult transportation in the 1880s and 1890s—but was not considered legally distinct from the bicycle for purposes of road use, licensing, or liability.
Webster's 1913 situates the tricycle within the velocipede family, a term that encompassed early human-powered wheeled vehicles before "bicycle" became the dominant category. Researchers working in sources from this era should be aware that velocipede, bicycle, and tricycle were sometimes used interchangeably in both popular and legal texts, and that statutory references to "velocipedes" may well encompass tricycles.
No other source dictionaries in the Law Mind corpus provide an independent tricycle entry. The gap in historical legal dictionary coverage is itself evidence that the term was treated as definitionally dependent rather than autonomous.
Jurisdictional Note
Modern vehicle codes vary substantially. Some states define "bicycle" to include tricycles by explicit statutory language; others maintain separate definitions or exclude tricycles from certain bicycle-specific rules (such as lane positioning requirements). Researchers should always locate the operative definitions section of the relevant jurisdiction's vehicle code rather than assuming bicycle law applies by analogy.