What does oath mean?
An oath is a solemn promise made with a degree of seriousness that distinguishes it from an ordinary assurance. It commonly refers to a religious vow, a formal promise of allegiance, or an affirmation given as evidence in a legal proceeding. Oaths traditionally invoke divine witness, public ceremony, or legal authority to make spoken words binding. Their use therefore carries a strong connotation of truthfulness, responsibility, and solemn obligation. A person who knowingly breaks an oath may be described as having violated their word or betrayed a solemn commitment. The term also appears in expressions associated with public office and formal testimony, although it is more common in ceremonial, religious, and legal language than in everyday conversation. While a simple promise may be casual, an oath implies that the promise is profound, consequential, and intended to endure.
nounA solemn promise, especially one made with great seriousness and often before God or under legal penalty. In legal contexts, an oath is a formal affirmation of truth or loyalty.
- A solemn and binding promise.
- A sacred commitment made before God or in a religious ceremony.
- A formal affirmation of truth or loyalty, especially one made in a legal proceeding.
- A formula expressing frustration or exasperation, used as an expletive.
"He swore an oath to protect the town and serve its people."
"Members of the council took an oath to uphold the new charter."
"By my oath, I will not betray your trust."
The usual plural of oath.
"The officials repeated their oaths before taking office."
An oath is more than a promise: it is a promise made binding by solemn ritual, testimony, or law.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does oath come from?
The English word descends from Old English āþ, used for a solemn promise or religious pledge. It continues Proto-Germanic *aiþą and is cognate with German Eid, Dutch eed, and Scandinavian forms such as Danish ed and Swedish ed. Across this word family, the central idea is a binding pledge or solemn declaration.
Related word forms
How oath is actually used
The word is formal, solemn, and often legal or religious. In everyday conversation, “promise” is usually more natural, while “vow” is common for a solemn personal commitment.
Easily confused with oath
An oath is a solemn promise, whereas ought expresses obligation, necessity, or expectation.