Definition
A Latin phrase meaning "and also," used in certain historical English pleading forms to introduce the true cause of action in proceedings where a fictitious cause of action was first alleged to establish court jurisdiction. The formula appeared most prominently in the capias ad respondendum — the writ commanding a defendant to appear and answer — issued by the Court of King's Bench. Because that court's jurisdiction was technically limited to matters involving a breach of the King's peace, plaintiffs bringing ordinary civil claims (such as debt) were required to allege a fictitious trespass to invoke jurisdiction. The ac etiam clause then followed, signaling the transition from that fictional allegation to the plaintiff's real grievance. The phrase thus served a structural function in pleading: it was the verbal bridge between legal fiction and substantive claim.
Common Confusion
Ac etiam is closely associated with the Bill of Middlesex, the fictitious allegation that preceded it, and with quominus, a comparable fictitious pleading device used in the Court of Exchequer to extend that court's jurisdiction over non-revenue matters. Researchers encountering these terms in historical writs should treat them as a cluster: the Bill of Middlesex, the ac etiam clause, and the capias ad respondendum frequently appear together as components of a single procedural mechanism. Confusing ac etiam (the transitional clause) with the fictitious allegation itself (the Bill of Middlesex) misreads how the document was structured.
Why It Matters in Research
Ac etiam is a marker of historical procedural architecture, not substantive law. Its significance in research is almost entirely contextual:
Researchers working in pre-nineteenth-century English common law records — particularly King's Bench proceedings — will encounter this phrase as a formulaic element in writs. Recognizing it correctly prevents misreading the document's structure. The clause signals that the pleading that follows it contains the genuine cause of action; everything before it may be legal fiction and should not be treated as a factual allegation.
The phrase disappeared from practice with the English procedural reforms of the nineteenth century, particularly the Common Law Procedure Act 1852 and the Judicature Acts of the 1870s, which abolished the old forms of action and eliminated the need for fictitious jurisdictional allegations. After that point, ac etiam vanishes from legal usage. Any encounter with the term in sources dated after roughly 1875 is almost certainly historical or academic in nature.
For researchers tracing the history of English court jurisdiction — particularly the expansion of King's Bench jurisdiction over common civil matters at the expense of the Court of Common Pleas — ac etiam and the Bill of Middlesex together illustrate how jurisdiction was manipulated through pleading convention rather than formal legislative grant. This is significant for understanding the competitive dynamics among the common law courts and the resulting pressure for procedural reform.
The alternate historical spellings noted by Burrill (acetiam, aceciam) are worth flagging for researchers working with manuscript sources or early printed reports, where variant spelling could cause a term to be overlooked in text searches.
Historical Dictionary Support
Black's (both editions) and Burrill agree on the core meaning and function of the term. All three sources identify it as a Latin phrase meaning "and also" and confirm its role as the introductory words of the clause stating the real cause of action in proceedings that required a prior fictitious allegation. There is no meaningful divergence among them on substance.
Burrill adds the most useful specificity: he identifies ac etiam as the name given to a particular clause in the capias ad respondendum, notes the variant spellings, and cites Townshend's Pleadings and Strange's Reports (2 Stra. 922) as authorities — both real historical sources available in older law library collections. This additional procedural grounding makes Burrill the richer source for understanding how the term functioned in practice.
Neither Black's edition expands on the pleading mechanics beyond a single-sentence description. Researchers seeking deeper treatment of the Bill of Middlesex and the ac etiam clause's role in King's Bench jurisdictional expansion should consult Blackstone's Commentaries (Book III) or Holdsworth's History of English Law, both of which address the fictional pleading system at length.
Jurisdictional Note
Ac etiam is exclusively a term of English common law procedure. It has no native equivalent in American legal practice. American courts, operating under different jurisdictional arrangements from their founding, never adopted the Bill of Middlesex or the capias ad respondendum in the form that generated this clause. The term appears in American legal dictionaries only as a historical reference.
Encyclopedia Cross-Reference
Law Mind Encyclopedia — Bill of Middlesex
Law Mind Encyclopedia — Fictitious Actions
Law Mind Encyclopedia — Capias ad Respondendum