Definition
In old English law, the uniting or combining together of persons for an unlawful purpose; a combination or conspiracy. The term describes concerted action among multiple parties directed toward some prohibited end, and functions as a near-equivalent to conspiracy in the Latin-law vocabulary of early English legal texts.
Common Confusion
COADUNATIO should not be confused with CONFEDERACY or COMBINATION in their broader senses. While all three terms can describe persons acting in concert, coadunatio carries a specifically conspiratorial connotation in the sources where it appears — not merely association or agreement, but coordinated action toward an unlawful object. Researchers encountering the term in Year Books or early reports should not treat it as a neutral descriptor of partnership or assembly.
Why It Matters in Research
This is a rare Latin-law term appearing almost exclusively in early English legal sources. Its practical significance to corpus researchers is narrow but specific: the term surfaces in readings and reports from the sixteenth and seventeenth centuries, and virtually all dictionary authorities trace it to a single source — Coke's Reports, volume 9. A researcher who encounters coadunatio in a manuscript or printed report from that period should treat it as a term of art pointing toward conspiracy doctrine as it was developing in early modern English law, not as a generic description of association.
Because the word does not survive into modern practice, it will not appear in post-eighteenth-century materials except as a historical reference. Searching for coadunatio in the Law Mind corpus should be understood as a targeted probe into pre-modern conspiracy doctrine rather than a search with broad retrieval potential. If the goal is tracing the conceptual lineage of conspiracy, this term marks an early node, and cross-referencing against CONSPIRACY, COMBINATION, and CONFEDERACY entries will capture the fuller arc.
Researchers working with Burrill's entry should note a textual artifact: the printed entry in some editions of Burrill contains an interpolated fragment ("cokettata; wools weighed and cocketted") that belongs to an adjacent entry for a customs term and has been run together with the coadunatio definition through a typesetting error. This corruption has propagated into some derivative references. The operative legal definition — uniting of persons together; a combination or conspiracy — is confirmed by Coke and is the reliable text.
Historical Dictionary Support
All four source dictionaries converge on a single definition: a uniting or combining of persons, amounting to a conspiracy. Black's (both editions) and Rapalje & Lawrence reproduce the definition in nearly identical language, each citing 9 Coke 56 as the sole authority. Burrill adds the Latin-law prefix notation and confirms the same source. No dictionary offers a competing definition or a broader application of the term, which is itself informative — this is a term with a single recorded legal use, anchored to a single authoritative citation, and it did not develop additional meanings over time.
The uniformity across dictionaries reflects the word's narrow footprint rather than independent verification. All sources are effectively tracing back to Coke. Researchers should treat this as a well-established gloss on a historical term rather than a living doctrine with evolving case support.
Jurisdictional Note
The term belongs exclusively to English legal history and has no independent development in American, Scottish, or other common-law jurisdictions. It appears in American legal dictionaries only as a historical entry carried forward from English sources.