The noun oath has 3 senses (first 2 from tagged texts)
1. (15) curse, curse word, expletive, oath, swearing, swearword, cuss -- (profane or obscene expression usually of surprise or anger; "expletives were deleted")
2. (2) oath, swearing -- (a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury)
3. oath -- (a solemn promise, usually invoking a divine witness, regarding your future acts or behavior; "they took an oath of allegiance")