Definition
An archaic Latin-derived term for the plaintiff, or the party who initiates a legal action. In historical common law pleading, the pulsator was the actor — the party who brings the suit and sets the court's process in motion. The term is functionally synonymous with plaintiff and was more common in early English and ecclesiastical court practice than in ordinary common law proceedings.
---
Common Language
Modern common usage (Wiktionary): A beater or striker; something that beats or throbs in working; a pulsating astronomical object; a jigging machine used in the South African diamond industry.
Historical common usage (Webster's 1913): "A beater; a striker. That which beats or throbs in working."
The gap here is total. In ordinary English, ancient and modern, a pulsator is something that physically beats or pulses. In legal usage, the word carries no mechanical meaning whatsoever — it is a procedural designation for the complaining party in a lawsuit. A researcher encountering this word in a historical legal document should treat it as a synonym for plaintiff without any inference from its mechanical common meaning.
---
Common Confusion
PULSATOR vs. REUS: In the Latin vocabulary of early civil and ecclesiastical procedure, the pulsator (plaintiff/actor) stands in opposition to the reus (defendant). Researchers working in medieval or early modern legal records may encounter both terms without explanation. Neither maps perfectly onto modern adversarial party terminology, particularly in ecclesiastical courts where the distinction between accuser and accused could blur depending on the proceeding's character.
PULSATOR vs. ACTOR: The terms are used interchangeably in historical sources. Some ecclesiastical and civil law authorities preferred actor; common law sources more often used plaintiff or complainant. Pulsator appears to be the more distinctly civil-law register of the same concept.
---
Why It Matters in Research
This is an essentially dead term in modern legal practice. Researchers will encounter it almost exclusively in:
1. Historical pleading records, particularly from ecclesiastical courts, admiralty proceedings, or courts operating under civil law traditions (such as pre-Revolution Louisiana or colonial courts with civilian influence).
2. Early English and American legal dictionaries, where it appears without commentary as a simple synonym for plaintiff.
3. Latin-language documents from English ecclesiastical jurisdiction, where pulsator was the standard designation for the party initiating proceedings.
The term is a reliable signal that a document has civil law or ecclesiastical law origins, or that it is written by someone drawing on Roman or canon law vocabulary. A researcher who finds pulsator in a record should investigate whether the court in question was operating under civilian rather than common law rules — a distinction that affects not only terminology but substantive procedural rights, evidentiary standards, and available remedies.
There are no known modern uses of pulsator as a legal term. Any appearance in post-19th-century legal documents is almost certainly a historical quotation, an archaism, or an error.
---
Historical Dictionary Support
The three source dictionaries are in complete agreement: pulsator means plaintiff, or actor. Black's (1st and 2nd editions) give identical one-line entries. Rapalje & Lawrence match, and add a curio — a parenthetical noting that "pulse (beans are a species of)" appears at Moore's Common Cases (Moo. C.C.) 323, 326. This aside has nothing to do with pulsator as a legal term; it appears to be a separate entry or annotation that crept into proximity. Researchers should not treat it as connected doctrine.
None of the historical dictionaries explain the term's origin, the courts in which it was most common, or its relationship to the civil law actor/reus framework. This is typical of the period's dictionaries, which treated Latin terms as self-explanatory to their educated readership. The absence of elaboration should not be read as absence of significance — the civil law provenance of pulsator carries real procedural implications that the dictionaries leave unstated.
---
Jurisdictional Note
Pulsator is not a term of art in any current American or English jurisdiction. It survives only in historical records. Researchers working in Louisiana's colonial or early statehood records, or in records of English ecclesiastical or admiralty courts, are most likely to encounter it in operative legal context.
---