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Webster's Dictionary (1865)

Ōath, n.

noun

(ōth), n. [O. Eng. othe, A-S. ādh, O. Sax. & O. Fries. eth, Goth. aiths, M. H. Ger. eit, O. & N. H. Ger. eid, D. eed, Icel. eidr, Dan. & Sw. ed.]

  1. A solemn affirmation or declaration, made with an appeal to God for the truth of what is affirmed. “An oath of secrecy for the concealing of those [inventions] which we think fit to keep secret.” Bacon.
  2. A careless and blasphemous use of the name of the divine Being, or any thing divine or sacred, either by way of appeal or as a profane exclamation or ejaculation.