Definition
A Latin adjective from old English law meaning "capable of being pledged" or "fit to serve as the subject of a pledge or security." The term describes property or persons that qualify legally as the object of a pledge arrangement — that is, something that may lawfully be delivered or offered as surety. It is a purely descriptive classifier, not a term of action: it identifies what is pledgeable, not the act or relationship of pledging itself.
Why It Matters in Research
This term appears almost exclusively in medieval legal Latin sources and their nineteenth-century transcriptions. Researchers are unlikely to encounter it outside of treatise-based scholarship on early English pledging and suretyship law. Its practical significance lies in identifying the boundaries of what the old law treated as valid collateral or surety — a question with real doctrinal stakes in medieval property and debt litigation.
The primary corpus anchor is Fleta, the late thirteenth-century Latin treatise on English common law (lib. 1, c. 20, § 98), which all three source dictionaries cite. Fleta is modeled closely on Bracton and represents the most authoritative Latin exposition of early common law procedure and obligation. Researchers working with Fleta or with parallel sources such as Britton or the early Year Books should treat plegiabilis as a term of art identifying the eligibility condition for pledge objects, not a freestanding legal right or remedy.
Because the term is adjectival and Latin, it will not appear in English-language statutes or case reports. It surfaces in scholarly commentary, nineteenth-century legal dictionaries, and Latin legal manuscripts. When researching suretyship or pledge in historical English law, researchers should be alert to the broader family of plegium-derived terms (see RELATED TERMS), which collectively describe the institution of pledge, the parties involved, and the obligations created.
No meaningful jurisdictional variation applies: the term is confined to medieval English legal Latin and has no continuing statutory or common law life in any modern jurisdiction.
Historical Dictionary Support
All three source dictionaries — Black's (first and second editions) and Burrill's — agree precisely on definition and citation. Each defines plegiabilis as "that which may be pledged; the subject of pledge or security," and each traces the term to Fleta, lib. 1, c. 20, § 98. The consistency reflects the shared dependence of these dictionaries on the same Latin source tradition rather than independent corroboration.
Burrill's entry adds the classifier "L. Lat." (Law Latin), which is editorially useful: it flags that the term belongs to the specialized legal Latin of the English courts rather than to classical Latin, a distinction that matters when tracing manuscript usage. Neither edition of Black's includes this notation, which is a minor gap for researchers who need to situate the term linguistically.
None of the three dictionaries offer any substantive analysis of what the old law required for property or persons to qualify as plegiabilis — that content must be sourced directly from Fleta and its scholarly commentary. The dictionary entries function solely as translation glosses, not doctrinal expositions.