Definition
Replicatio (Latin) is a term from Roman civil law and old English pleading denoting the plaintiff's formal answer to the defendant's exception or plea. Where the defendant raised an exceptio — a defensive plea interposed to defeat or delay the plaintiff's claim — the plaintiff could respond with a replicatio, effectively neutralizing the exception by alleging new matter that restored the plaintiff's position. The replicatio is the direct ancestor of the modern replication in common law pleading.
Paulus described the replicatio as a contraria exceptio — a counter-exception, or the exception of an exception — capturing its structural logic: just as the defendant's exceptio cut against the plaintiff's initial claim, the replicatio cut back against the exceptio.
Common Confusion
Replicatio and replication are not the same thing, though they are closely related. Replicatio is the Roman and civil law term; replication is its common law successor and anglicized descendant. In modern usage, replication refers to the plaintiff's answer to a plea in equity or at common law, the same procedural moment but in a different legal system. Researchers working with historical English sources may encounter both terms in overlapping periods, particularly in equity pleading, where civil law influence persisted longer than at common law. Do not assume that every use of replicatio in an English legal source signals a civil law proceeding — it may simply be a Latinized usage of what the writer understood as ordinary pleading practice.
Why It Matters in Research
This term is primarily a research access point rather than a living doctrine. It appears in:
Latin-language civil law sources, particularly Justinian's Institutes (4.14) and the Digest (44.1.2.1), where the full architecture of exceptio, replicatio, duplicatio, and triplicatio is set out as a formal sequence of pleading exchanges. Researchers tracing the Roman procedural origins of modern pleading stages will encounter replicatio as the third move in that sequence.
Old English pleading records, where Latin terminology remained standard long after the underlying procedure had begun to diverge from Roman practice. A replicatio appearing in a medieval English plea roll may signal either genuine civil law influence or mere scribal convention.
Equity pleading scholarship, where the replication — replicatio's direct descendant — survived as a formal stage of written pleading well into the nineteenth century. Understanding replicatio clarifies why the equity replication carried the weight it did: it was not mere formality but a substantive pleading move with Roman procedural authority behind it.
The trap for researchers: because the term appears in both Roman law sources and in anglicized Latin, it can look like evidence of civil law procedure in contexts that are actually common law. Context — the court, the date, the surrounding terminology — must govern interpretation.
Historical Dictionary Support
Black's Law Dictionary (both editions) and Burrill's Law Dictionary are in close agreement on substance. All three sources define replicatio as the plaintiff's answer to the defendant's exception or plea and identify it as the source of the modern term replication. Burrill adds the most useful detail: the Latin derivation (replicare, to unfold), the party identifications (actor for plaintiff, reus for defendant), and the Pauline characterization as contraria exceptio, quasi exceptio exceptionis — a contrary exception, as it were the exception of an exception. Burrill also supplies an additional citation to the Digest (44.1.2.1) alongside the Institutes reference, giving researchers two Roman law anchors rather than one.
What all three sources omit is any account of the full pleading sequence of which replicatio was a part. In Roman procedure, after the replicatio came the duplicatio (defendant's answer to the replicatio), then the triplicatio (plaintiff's answer to the duplicatio), and potentially further exchanges. Knowing where replicatio sits in that sequence — third, not final — is essential for researchers tracing how individual pleading stages were labeled and understood in both civil and common law traditions.
None of the historical sources address the question of whether and when English courts used replicatio as a term of art rather than merely as a Latin gloss on the vernacular replication. That question requires engagement with primary sources, not dictionary entries.
Jurisdictional Note
Replicatio as an operative term belongs to Roman civil law and to historical English practice. It has no current procedural life in American courts. Researchers working with Louisiana sources or other jurisdictions with civil law heritage may find replicatio cited in older treatises as part of civilian pleading theory, but even there it functions as historical vocabulary rather than active doctrine.