Definition
A Latin adverb meaning "unanimously" or "with one mind" — without dissent or division. The term appears in medieval English legal records and treatises to indicate that a decision, verdict, or act was made by complete agreement of all parties, jurors, or members of a body. It carries the same substantive meaning as the modern English "unanimously" but in the form used in Latin-language legal writing.
Why It Matters in Research
UNANIMITER is a term researchers will encounter almost exclusively in medieval and early modern English legal sources written in Law Latin. Its significance is positional and confirmatory: when the word appears in a record, it signals that a finding or judgment was reached without dissent, which can bear on questions of procedural regularity, the validity of a verdict, or the force of a decision within a deliberative body.
Researchers working in plea rolls, court records, or treatises from the twelfth through seventeenth centuries should recognize UNANIMITER as a term of record rather than argument — it typically appears as a recital in the body of a document rather than as a contested legal concept. Confusion arises when transcribed records are partially translated and the term is left in Latin while surrounding text is rendered in English; in that context, the word can appear opaque without a working Latin vocabulary.
The term is particularly associated with jury proceedings. In the common law tradition, jury unanimity was a structural requirement for a valid verdict, and UNANIMITER in a record confirms that formal requirement was met. Its presence is therefore a marker of procedural completeness.
Researchers should also be alert to abbreviated forms in manuscript sources — Latin adverbs were frequently contracted in medieval court hand, and UNANIMITER may appear in shortened form depending on the scribe and the period.
Historical Dictionary Support
Burrill's Law Dictionary is the primary historical dictionary source for this term. Burrill defines it concisely as "unanimously; without dissent," traces it to its Latin components (unus, one + animus, mind), and supplies a citation to Fleta, book 1, chapter 34, section 36 — a thirteenth-century English legal treatise written in the reign of Edward I. The Fleta citation is precise and reliable; the treatise is a genuine medieval source closely related to Bracton and well-known in the medieval English legal tradition.
Burrill's entry is brief, as appropriate for a term with a single, fixed meaning. No substantive divergence from its definition is possible; the legal meaning is simply the Latin expression of a concept that translates directly. Historical sources do not treat UNANIMITER as a term of controversy or doctrinal complexity. It is a functional word of record, and the dictionaries reflect that.
No significant disagreement exists across historical sources on this term's meaning. What historical dictionaries do not supply — and what researchers need — is the contextual understanding that the term belongs to a stratum of legal Latin used in formal record-keeping and treatise writing, not in argument or pleading.