Definition
Excommunication is a formal ecclesiastical censure by which a person is expelled from the communion of a church and deprived of its rites, sacraments, and spiritual benefits. In its canonical form, it is the most severe penalty available to church authority, cutting the subject off from participation in religious community and, historically, from the legal and social consequences that membership in the established church carried with it.
In legal history, excommunication carried significant civil consequences in jurisdictions where church and state were intertwined. In England prior to the reforms of the nineteenth century, an excommunicated person could not sue in the ecclesiastical courts, could not serve as a juror or witness, and in some periods was subject to imprisonment at the crown's hand if the church certified the excommunication to civil authorities — a process accomplished through the writ de excommunicato capiendo.
The term encompasses two historically recognized degrees of severity:
(1) Minor excommunication: exclusion from participation in the sacraments and church ordinances, without complete severance from the community of the faithful.
(2) Major excommunication (the greater excommunication): complete expulsion from the church, with accompanying anathema in the most solemn cases, and historically triggering the full range of civil disabilities.
Common Language
Modern common usage (Wiktionary): The act of officially excluding someone from membership in a church or religious community, or more loosely, any formal ostracism or exclusion from a group.
Historical common usage (Webster's 1913): "The act of communicating or expelling from the communion of a church by an ecclesiastical sentence." Webster distinguishes the greater excommunication, cutting off from the whole body of the faithful, from the lesser, which merely excludes from sacraments and church services.
The common usage is closer to the legal meaning here than with many terms, but the critical gap is civil consequence. Modern usage treats excommunication as a purely ecclesiastical and social matter. The historical legal meaning is inseparable from its temporal effects — disabilities in court, loss of civil rights, and state enforcement mechanisms that made the church's sentence operative in secular law. A researcher reading historical legal sources must not strip the term of those civil dimensions.
Recognized Forms
/SUBTYPES
Minor Excommunication: Exclusion from sacraments and liturgical participation; did not historically carry the full weight of civil disability.
Major Excommunication: Complete severance from church membership; in England, the form that triggered civil consequences including the writ de excommunicato capiendo, by which the sheriff was directed to imprison the censured person.
Anathema: The most solemn form of major excommunication, involving formal cursing and complete separation; treated in canon law as a distinct intensification of major excommunication, though in common legal usage the terms were sometimes conflated.
Why It Matters in Research
This term is a historical evolution term. Its legal significance is almost entirely historical — excommunication ceased to carry civil consequences in England with the Ecclesiastical Courts Act 1813 and subsequent reforms, and the writ de excommunicato capiendo was finally abolished by the Ecclesiastical Courts Act 1813. American law never adopted the civil disabilities framework, given the constitutional separation of church and state.
Researchers working in pre-nineteenth-century English legal sources will encounter excommunication as a genuinely operative legal mechanism, not merely a theological curiosity. The intersection points matter: ecclesiastical court jurisdiction, the enforcement writ, witness competency rules, and the law of disabilities all connect here. Confusion arises because modern readers approach the term expecting a purely religious concept and may miss the procedural machinery surrounding it.
In American sources, the term appears almost exclusively in constitutional and religious liberty contexts — disputes over church property, the legal validity of church disciplinary proceedings, and the limits of civil court review of ecclesiastical decisions. American courts have generally held that civil courts will not inquire into the correctness of excommunication decisions but may examine whether proper procedures were followed when civil property rights depend on church membership status.
Researchers should also note that the Law Mind corpus will surface this term in ecclesiastical law treatises sitting alongside common law materials. The two bodies of law operated in parallel for centuries, and excommunication is one of the clearest points of contact between them.
Historical Dictionary Support
Rapalje & Lawrence define excommunication as "an ecclesiastical censure, whereby the party against whom it is pronounced is excluded from the communion of the church, and disabled from bringing any suit or action." This is accurate as a summary but somewhat compressed. The definition captures the civil disability dimension — the exclusion from suit — which is the legally operative element most important for researchers, but it does not develop the writ mechanism or the distinction between the two degrees.
What Rapalje & Lawrence does not address is the American treatment, where the civil disability framework was never received and the legal relevance of the term shifted entirely to property disputes and religious liberty. This is a gap typical of dictionaries drawing primarily from English sources: the American context requires supplementation.
Historical dictionaries uniformly treat this as an ecclesiastical law term with legal consequence. None of the major historical sources treat it as a purely theological matter, which is itself instructive — it confirms that for any period prior to the nineteenth century reforms, the civil dimension is not a secondary consideration but a primary one.
Jurisdictional Note
English law attached significant civil consequences to excommunication, enforced through royal writs, until the early nineteenth century. American law never adopted this framework; the First Amendment's religion clauses foreclosed state enforcement of ecclesiastical censures, and American courts have consistently treated excommunication as an internal church matter into which civil courts will not ordinarily intrude. Researchers must not carry English historical assumptions about civil disability into American legal contexts.