Definition
Swearing, in law, refers to the formal act of taking an oath — invoking a divine or solemn authority as a witness to the truth of a statement or the sincerity of a promise. It is the mechanism by which a witness, juror, public officer, or party binds themselves legally and morally to truthfulness or faithful performance, and upon which the law's sanctions for perjury and false swearing attach.
Two primary legal uses:
1. Swearing as oath-taking in testimony. A witness is "sworn" before giving testimony, affirming under penalty of perjury that their statements are true. The act of swearing is what transforms a statement from mere assertion into legally cognizable testimony.
2. Swearing as oath of office or duty. Public officers, jurors, and certain appointees are "sworn in" to their roles, creating a legal obligation enforceable in ways beyond ordinary contract.
The act may be performed by swearing (invoking God or a deity) or, where conscience or belief precludes this, by affirmation — a secular equivalent recognized by statute and constitutional provision in most jurisdictions. For legal purposes, affirmation carries identical weight and identical perjury exposure.
Common Language
Modern common usage (Wiktionary): Present participle and gerund of "swear" — encompassing both the act of oath-taking and the act of using profane or vulgar language.
Historical common usage (Webster's 1913): "Idle swearing is a cursedness." The primary connotation in everyday historical usage leaned toward profanity or vain oaths — invoking God's name carelessly or blasphemously.
Editorial note: The legal meaning and the common meaning share the same root but diverge sharply in context and consequence. In ordinary speech, swearing most readily calls to mind profanity. In law, swearing is a formal, consequence-laden act with defined procedures and criminal penalties for abuse. A researcher reading historical sources must attend carefully to which sense is intended — courts and moralists of earlier centuries frequently addressed both in close proximity, and the distinction between a "false oath" (legal) and "vain swearing" (moral/religious) was not always cleanly drawn.
Common Confusion
Swearing is sometimes treated as interchangeable with affirmation or attestation, but these are legally distinct acts. An affirmation is a statutory substitute for an oath, equally binding but non-theistic in form. Attestation is the witnessing of a signature or document, which does not necessarily carry oath-level legal obligations. Additionally, swearing in the sense of oath-taking must be distinguished from swearing in the sense of profane language — an irrelevant but recurring confusion in older moral and legal literature that can mislead researchers parsing historical commentary.
Why It Matters in Research
The word "swearing" in historical legal sources can appear in three distinct registers: formal oath procedure, moral condemnation of blasphemy, and evidentiary foundation for perjury prosecutions. Researchers must identify which register is operative. Pre-nineteenth-century sources frequently fuse the moral and legal dimensions, reflecting an era when courts treated false swearing as an offense against God as much as against the administration of justice.
Jurisdictional variation in oath requirements matters for corpus research. Early American statutes often tracked English common law practice closely but diverged on religious qualification — who could swear, what formula was required, and whether Quakers and other non-swearing sects could substitute affirmation. These rules directly affected who could testify and who could hold office, making "swearing" a gatekeeping term with significant practical stakes in historical litigation records.
Perjury entries in any corpus are tightly linked to swearing: perjury cannot be committed without a prior lawful oath, so the validity of the swearing act itself was frequently litigated. Researchers working perjury questions must trace backward to the oath's administration.
The Rapalje & Lawrence entry retrieved under this search term is a cataloguing artifact — the retrieved text covers "Surviving Sons and Daughters" and "Survivor," indicating a proximity match rather than a substantive entry on swearing itself. This is a known limitation of index-based historical dictionary retrieval and should not be read as Rapalje & Lawrence's treatment of the term.
Historical Dictionary Support
Rapalje & Lawrence does not appear to contain a dedicated entry for "swearing" as a standalone term — the retrieved content reflects adjacent index entries. This is itself informative: by the late nineteenth century, "swearing" as a discrete legal concept was sufficiently well-settled that specialized legal dictionaries often folded it into oath, perjury, or affirmation entries rather than treating it independently.
Webster's 1913 preserves the older moral weight of the term through the Chaucer quotation ("Idle swearing is a cursedness"), reflecting the period when vain or false oaths were simultaneously sins and legal wrongs. This dual character shaped early common law perjury doctrine, which required not just falsehood but willful, corrupt false swearing.
The gap between historical dictionary coverage and modern doctrinal treatment is notable: modern sources address swearing primarily through the mechanics of oath administration and the elements of perjury, stripping away the theological overlay that earlier sources carried.
Jurisdictional Note
American jurisdictions universally recognize both oath and affirmation as legally equivalent, codified in federal and state evidence statutes. English practice historically imposed religious qualifications on oath-takers that American courts rejected earlier and more completely. In some states, the precise form of the oath — the words used, the physical act of raising a hand or placing a hand on scripture — is still prescribed by statute, and defects in form can, in limited circumstances, affect the validity of testimony or the availability of perjury charges.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Oaths and Affirmations (for the formal requirements and legal equivalence of swearing and affirmation); Perjury (for the criminal consequences of false swearing and the requirement of a lawful prior oath).