Definition
To swear, in legal usage, carries two distinct meanings that must be kept separate:
1. To administer an oath. An officer or magistrate with authority to administer oaths "swears in" a witness, affiant, or public official by formally placing that person under oath. The act is complete when the administered oath is received.
2. To take an oath. A person "swears" by voluntarily submitting to a duly administered oath and becoming legally bound by its terms. This is the sense operative in testimony, affidavits, complaints, and assumption of public office. The oath must be administered by an officer empowered to do so; an oath self-imposed without such authority creates no legal obligation and exposes the swearer to no legal liability for perjury or false swearing.
3. To use profane or blasphemous language. A distinct criminal-law usage, historically punishable by statute in many jurisdictions. This meaning operates entirely outside the civil-law and evidentiary contexts.
Common Language
Modern common usage (Wiktionary): To take an oath with legally binding effect; to promise intensely or solemnly; to administer an oath; to use offensive or profane language.
Historical common usage (Webster's 1913): To affirm solemnly with an appeal to God or a sacred object; to give evidence on oath; also, to use profane language.
The common and legal meanings overlap substantially, but the legal usage draws a line that ordinary speech ignores: only an oath administered by a competent officer binds the swearer legally. A person who "swears" in the colloquial sense — making a fervent personal promise — has done nothing with legal consequence. Bouvier flags this precisely: one may swear without being duly sworn, and the self-imposed oath generates no liability.
Common Confusion
The verb's dual directionality creates a persistent confusion in historical records. "To swear a witness" means to administer the oath to that witness. "The witness swore" means the witness took the oath. Both appear in the same procedural documents, and careless reading can invert the legal relationship — misidentifying who held the authority and who was bound.
A second confusion runs between swearing and affirming. Where a party objects to oath-taking on religious or conscientious grounds, an affirmation substitutes for the oath. Courts and statutes frequently treat them as equivalent in legal effect, but they are formally distinct acts. Researchers conflating the two may miscategorize records of Quaker or affirmation-based testimony in historical court files.
Why It Matters in Research
The functional split between administering and taking an oath is jurisdictionally loaded. Early American statutes governing who could administer oaths — justices of the peace, notaries, commissioners — controlled whether a sworn instrument was valid. An affidavit sworn before an officer lacking authority was legally defective even if the swearer's intent was sincere. Researchers working with antebellum complaints, deposition transcripts, or territorial-era affidavits should verify the administering officer's statutory authority, not merely confirm that swearing language appears on the face of the document.
Anderson's note on the certificate formulation is practically useful: "taken and sworn before me" was recognized as sufficient in form; alternative phrasings like "sworn before me" passed muster; but "depose and swear" without more did not always establish that a proper oath was administered. These distinctions surface in challenges to the sufficiency of pleadings and criminal complaints throughout the nineteenth century.
The profanity meaning generates a separate body of statutory material — vagrancy codes, morals ordinances, and early criminal statutes — that clusters in state-level sources and is indexed inconsistently. Corpus researchers querying "swear" or "swearing" in nineteenth-century statutory compilations will retrieve entries from both the oath context and the profanity context. Disambiguation requires reading the surrounding statutory scheme.
Historical Dictionary Support
Black's (both editions) and Rapalje & Lawrence present the term efficiently, pairing the two oath-related senses and noting the profanity offense without extended analysis. Rapalje cross-references OATH and stops there, reflecting that dictionary's preference for economy over exposition.
Anderson's is the most procedurally useful of the shelf sources. Its attention to the specific certificate language that courts accepted or rejected gives researchers a working test for evaluating historical instruments. The note on "depose and swear" — that the phrase alone did not always establish that the swearer was in fact sworn — reflects real litigation over pleading sufficiency.
Bouvier's contributes the most doctrinally precise observation: the distinction between being sworn and swearing, and the consequence that an improperly administered or self-imposed oath creates no legal liability. The Federal Reporter citation Bouvier provides (33 Fed. Rep. 168) anchors this principle in case authority from the 1880s. Bouvier also cross-references JURY and OATH, signaling the term's radiating connections across evidentiary and procedural doctrine.
None of the historical dictionaries address the constitutional dimension of oath requirements — the Article VI and Article II clauses, or the First Amendment complexities raised by compelled oath-taking — which means researchers working in those areas must move beyond the dictionary shelf to treatises and constitutional commentary.
Jurisdictional Note
The authority to administer oaths varies by state statute and has changed significantly over time. Notaries, commissioners of deeds, and justices of the peace held different and sometimes overlapping powers across jurisdictions. Profanity statutes, where they survived into the twentieth century, faced First Amendment challenges with uneven results; many were narrowed or repealed. Researchers should not assume that oath-administering authority recognized in one state's practice transferred across territorial or state lines.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Oath and Affirmation; Perjury and False Swearing; Affidavit Practice and Form