noun (n)

• profane or obscene expression usually of surprise or anger(noun.communication)

  Synonym:
  curse, curse word, cuss, expletive, swearing, swearword
  

  source: wordnet30
• a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury(noun.communication)

  Synonym:
  swearing
  

  source: wordnet30
• a solemn promise, usually invoking a divine witness, regarding your future acts or behavior(noun.communication)

  Example:
  They took an oath of allegiance.
  

  source: wordnet30
• A solemn affirmation or declaration, made with a reverent appeal to God for the truth of what is affirmed.(noun)

  source: webster1913