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Definition of oath: 1. A careless and blasphemous use of the name of the divine Being, or anything divine or sacred, by way of appeal or as a profane exclamation or ejaculation; an expression of profane swearing.
2. A solemn affirmation or declaration, made with a reverent appeal to God for the truth of what is affirmed.
3. A solemn affirmation, connected with a sacred object, or one regarded as sacred, as the temple, the altar, the blood of Abel, the Bible, the Koran, etc.
4. An appeal ( in verification of a statement made) to a superior sanction, in such a form as exposes the party making the appeal to an indictment for perjury if the statement be false.

Synonyms:

feller, curse word, lad, bane, jinx, epithet, expletive, hex, bad language, fellow, anathema, words, four-letter word, whammy, swearword, ban, nemesis, torment, obscenity, imprecation, pesterer, blaspheming, execration, cuss, reprobation, adjuration, troth, profanity, pest, sacred, cursing, chap, sworn statement, blasphemy, bloke, decent, affidavit, gadfly, condemnation, profane swearing, gent, scourge, fella, denial, blighter

promises (part of speech: noun)

commitment, undertaking

affirmation (part of speech: noun)

affirmation, corroboration, ratification, confirmation, assertion, statement, certification, warranty, endorsement, verification, attestation, promise, acknowledgment, validation, assurance, submission, approval, avowal, declaration, sanction, testimony, pronouncement, admission, pledge, proclamation

malediction (part of speech: noun)

vilification, invective, vituperation, malediction, denunciation, swearing, damnation, abuse, disparagement, curse

guarantee (part of speech: noun)

token, deposit, countersignature, contract, insurance, guarantee, safeguard, word, collateral, security, bond, lien

promise (part of speech: noun)

understanding, covenant, consent, compact, mutual agreement, engagement, pact, vow, arrangement, stipulation, agreement, obligation

See how do you define oath. See oath definition.