Definition
To turn aside; to redirect from an established or intended course. In law, the term carries two distinct functional meanings:
1. PHYSICAL DIVERSION. The act of altering the course of a natural or artificial channel — most commonly water — so that it no longer flows in its original direction or reaches those downstream entitled to it. A landowner who diverts a stream may interfere with riparian rights of other property owners.
2. CRIMINAL JUSTICE DIVERSION. The redirection of a person accused of a crime away from standard prosecution and into an alternative program — such as treatment, counseling, or supervised deferral — with charges dismissed or withheld upon successful completion. This usage is entirely modern and absent from historical legal dictionaries.
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Common Language
Modern common usage (Wiktionary): To turn aside from a course; to distract; to entertain or amuse by diverting the attention.
Historical common usage (Webster's 1913): To turn aside or deflect from any course or intended application; also, to turn away from occupation or study so as to amuse or entertain.
The common meaning of "divert" — to redirect or to amuse — tracks the physical legal meaning reasonably well. The gap lies in the criminal justice sense: nothing in ordinary language use anticipates a formal procedural mechanism by which prosecution is suspended in favor of rehabilitative alternatives. A researcher encountering "diversion program" or "pretrial diversion" in legal materials should not rely on the common meaning to understand what is at stake.
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Common Confusion
The modern criminal justice usage of "divert" and "diversion" has so thoroughly displaced the older property-law usage in contemporary legal discourse that researchers may encounter the terms in historical sources — particularly water rights, easement, and road cases — and mistakenly import procedural connotations. Conversely, researchers working in riparian law or property may overlook that the same term now anchors an entire field of criminal procedure. The two meanings share no conceptual overlap and arise in entirely different areas of doctrine.
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Why It Matters in Research
The split between the physical and criminal-procedural meanings is the central research trap here. Historical legal dictionaries — Black's (1st and 2nd editions), Burrill's — define "divert" exclusively in the property sense. A researcher relying on those sources alone will find no guidance on diversion as a criminal justice mechanism, which emerged as a formal legal concept in the latter half of the twentieth century, gaining particular momentum with the expansion of drug courts, juvenile justice reform, and prosecutorial discretion doctrine.
In older materials (pre-1950), "divert" almost always means physical redirection — water, roads, commerce. In materials from the 1970s onward, especially in criminal law, procedure, and statutory contexts, "divert" and "diversion" almost always mean pretrial or prosecutorial diversion. The chronological dividing line is sharp enough to use as a dating heuristic.
For water rights research, pay close attention to jurisdictional context: the term carries different legal weight under prior appropriation doctrine (western states) versus riparian rights doctrine (eastern states). Diverting water without authorization in a prior appropriation state can constitute a taking of another's vested water right; in a riparian state the analysis differs significantly.
For criminal procedure research, note that "diversion" encompasses a spectrum of programs — pretrial diversion, deferred prosecution, deferred adjudication, and informal adjustment in juvenile proceedings — each with distinct procedural consequences. These are related but not interchangeable, and statutory definitions vary considerably by jurisdiction.
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Historical Dictionary Support
Black's (1st and 2nd editions) and Burrill's are in complete agreement: "divert" means to turn aside or alter the course of things, applied primarily to watercourses and occasionally to roads. All three cite Angell on Water-Courses (§ 97 et seq.) and the same English authority (8 East, 394) — suggesting this was a settled, narrow term of art in property and water law with no contested edges worth noting in the nineteenth-century dictionaries.
Burrill adds the Latin derivation (divertere) as a header note, consistent with his dictionary's more scholarly orientation, but the substantive definition is identical across all three sources. None of the historical dictionaries anticipate any procedural or criminal law dimension of the term. This is not a gap or oversight in those sources — the modern usage simply did not exist as a legal category when they were compiled.
What the historical dictionaries collectively miss: the entire modern criminal justice apparatus now organized under this term. Any researcher working with diversion as a criminal law concept must look to twentieth- and twenty-first-century statutory sources, prosecutorial guidelines, and secondary literature rather than the historical dictionary shelf.
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Jurisdictional Note
In water law, "divert" is particularly consequential in prior appropriation states (broadly, states west of the 100th meridian), where diversion without a valid water right can constitute an actionable wrong against senior appropriators. In riparian doctrine states, the analysis centers on reasonable use rather than priority, giving the act of diversion a different legal valence. In criminal procedure, diversion programs are largely creatures of state statute and local prosecutorial policy, with no uniform federal framework governing eligibility, conditions, or consequences.
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Riparian Rights; Prior Appropriation Doctrine; Pretrial Diversion and Deferred Prosecution.
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