Definition
As a standalone legal term, "Fourth" functions almost exclusively as a shorthand reference to the Fourth Amendment to the United States Constitution. In this context, it is not an ordinal adjective modifying another noun but a proper noun-equivalent identifying a specific constitutional provision. The Fourth Amendment prohibits unreasonable searches and seizures by government actors and requires that warrants be supported by probable cause, describe with particularity the place to be searched and the persons or things to be seized, and be issued by a neutral magistrate.
In older legal documents and statutory drafting, "fourth" appears in its ordinary ordinal sense — designating the fourth section of a statute, the fourth paragraph of a contract, or the fourth count of an indictment. This usage carries no independent legal meaning beyond sequencing.
Common Language
Modern common usage (Wiktionary): The ordinal form of the number four.
Historical common usage (Webster's 1913): Next in order after the third; the ordinal of four. Forming one of four equal parts into which anything may be divided.
When lawyers, judges, and researchers say "the Fourth" without further qualification, they almost never mean an ordinal position. They mean the Fourth Amendment and, by implication, the entire doctrinal architecture of constitutional search-and-seizure law. A researcher encountering "Fourth" in isolation in a legal brief, judicial opinion, or law review article should treat it as constitutional shorthand, not a positional marker.
Common Confusion
"The Fourth" as constitutional shorthand should not be confused with references to the Fourth Circuit (the U.S. Court of Appeals for the Fourth Circuit, covering Maryland, Virginia, West Virginia, North Carolina, and South Carolina). Context usually disambiguates — "Fourth Circuit" is typically written out — but in informal or abbreviated legal writing, researchers should confirm which reference is intended. Similarly, "fourth" appearing in older civil service statutes and administrative regulations (as in the Anderson source material here, which quotes language about civil service commission duties) is purely ordinal and has no connection to constitutional doctrine.
Why It Matters in Research
The primary research value of this entry is navigational disambiguation. Corpus searches on "fourth" will return enormous noise: fourth counts, fourth sections, fourth clauses, fourth-quarter contract deadlines, and references to the Fourth Circuit, in addition to Fourth Amendment material. Researchers targeting constitutional search-and-seizure doctrine should search "Fourth Amendment" as a phrase rather than "fourth" alone.
Historically, Fourth Amendment doctrine was thin in 19th-century sources. The amendment was ratified in 1791, but robust judicial interpretation did not develop until the 20th century, accelerating significantly after incorporation against the states through the Fourteenth Amendment. Pre-20th-century legal dictionaries — including Anderson's — largely treat search-and-seizure doctrine in passing. The Anderson entry reflected in the source material here is not a Fourth Amendment entry at all; it quotes civil service commission language, which illustrates how older general legal dictionaries did not yet treat "the Fourth" as a standalone term of art warranting its own entry.
The doctrine has evolved substantially across three research periods: (1) the pre-incorporation era, when the amendment applied only to federal actors; (2) the mid-20th century expansion through cases establishing the exclusionary rule and incorporation; and (3) the modern era of digital surveillance, third-party doctrine, and shifting reasonable-expectation-of-privacy analysis. A researcher must identify which period's doctrine governs the question under study — cases and treatises from one era may be unreliable guides to another.
Jurisdictional note: Fourth Amendment doctrine is federal constitutional law and applies uniformly to all states through incorporation, but state constitutions frequently provide independent and sometimes broader search-and-seizure protections. State court decisions interpreting state constitutional analogues to the Fourth Amendment may diverge significantly from federal doctrine and will appear in state reporters under state constitutional provisions, not under "Fourth Amendment" analysis.
Historical Dictionary Support
Anderson's Dictionary of Law does not provide a substantive entry for "Fourth" as a constitutional term. The passage preserved in the source material is excerpted from a civil service statute describing investigatory powers — an entirely different context. This is consistent with the general pattern of 19th-century legal dictionaries: they predate the doctrinal flowering of Fourth Amendment law and offer researchers little guidance on search-and-seizure doctrine as it is now understood. Researchers relying on Anderson's or contemporaneous dictionaries for Fourth Amendment analysis will find the well dry. Modern constitutional law treatises and annotated codes are the appropriate starting points for that research.
Encyclopedia Cross-Reference
The Law Mind Criminal Law Encyclopedia:
— Fourth Amendment — Overview and Scope (criminal_141)
— Fourth Amendment — The Warrant Requirement (criminal_144)
— Fourth Amendment — Probable Cause (criminal_145)