Definition - Oath

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Oath

a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury
profane or obscene expression usually of surprise or anger; "expletives were deleted"
a solemn promise, usually invoking a divine witness, regarding your future acts or behavior; "they took an oath of allegience"
A solemn affirmation or declaration, made with a reverent appeal to God for the truth of what is affirmed.