Definition
"Plenarie" is a Latin adverb meaning "fully" or "completely." In historical legal usage, it appears as a formal adverb modifying procedural or substantive legal terms to indicate that something was done in full measure — with complete authority, full process, or without limitation. It is the adverbial form of the Latin adjective "plenus" (full) and shares a root with the more familiar legal adjective "plenary."
The term itself does not carry independent doctrinal weight. Its significance lies in its function as a qualifier in medieval and early modern legal Latin, where precision about the completeness of an act, authority, or proceeding was legally material. A court acting "plenarie" acted with full jurisdiction. A proceeding conducted "plenarie" was one completed according to full formal process, as opposed to a summary or abbreviated form.
Why It Matters in Research
Researchers encountering "plenarie" will find it almost exclusively in medieval and early modern sources written in legal Latin — treatises such as Fleta and Bracton, year books, and early plea rolls. Burrill's citation to Fleta, lib. 2, c. 64, § 19 situates the term squarely in thirteenth-century English legal writing.
The practical research trap is treating "plenarie" as a standalone term rather than recognizing it as an adverbial modifier. In historical sources, the word gains meaning from whatever term it modifies. Strip it from context and it tells you almost nothing. Restore the surrounding phrase and it may illuminate the nature of the proceeding, the scope of authority claimed, or the degree of process afforded.
The more consequential research path runs from "plenarie" to its adjectival descendant "plenary." Modern legal doctrine — particularly the plenary power doctrine in immigration law and federal power over Indian tribes — carries forward the same conceptual core: full, unreviewable, or complete authority. A researcher tracing the intellectual genealogy of plenary power back through English and civil law sources will move through "plenary" and eventually encounter "plenarie" as the archaic form in the oldest stratum of legal Latin materials.
Researchers using Law Mind's historical sources should note that Burrill is the primary dictionary resource here. Bouvier, Jacob, and Black do not carry this entry in their standard forms. That absence reflects the term's status as working legal Latin rather than a recognized doctrine or term of art requiring definition in practitioner references.
Historical Dictionary Support
Burrill's Law Dictionary provides the only historical dictionary entry for this term, glossing it simply as "Fully" with a citation to Fleta. The entry is minimal by design — Burrill includes it as part of his systematic coverage of Latin and law-French terms appearing in primary sources, not because "plenarie" carries contested meaning. The definition is unambiguous and there is no meaningful divergence across sources, because no other major dictionary in the Law Mind corpus addresses it directly.
The Fleta citation is useful for locating the term in context. Fleta is a late thirteenth-century English legal treatise modeled on Bracton, and book 2 concerns procedural and jurisdictional matters. The specific section cited (c. 64, § 19) touches on pleadings and the manner of proceeding in court — a natural home for an adverb indicating completeness of process.
Historical sources beyond Burrill are largely silent on "plenarie" as a dictionary entry, which is itself informative: the term was considered self-explanatory to anyone trained in legal Latin, requiring at most a gloss, not a definition.
Encyclopedia Cross-Reference
The modern doctrinal heir of "plenarie" is the plenary power doctrine. For researchers moving from the historical term toward its contemporary legal significance:
— Immigration and Deportation: Plenary Power Doctrine and Due Process (The Law Mind Constitutional Law Encyclopedia, constitutional_149)
— Immigration Law: Overview, Constitutional Authority (Plenary Power Doctrine), and the INA (The Law Mind Immigration Law Encyclopedia, immigration_1)
— Indian Tribes and Constitutional Law: Sovereignty, Plenary Power, and Treaty Rights (The Law Mind Constitutional Law Encyclopedia, constitutional_56)