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From The Collaborative International Dictionary of English v.0.48:
Oath \Oath\ ([=o]th), n.; pl. Oaths ([=o][th]z). [OE. othe, oth, ath, AS. [=a][eth]; akin to D. eed, OS. [=e][eth], G. eid, Icel. ei[eth]r, Sw. ed, Dan. eed, Goth. ai[thorn]s; cf. OIr. oeth.] 1. A solemn affirmation or declaration, made with a reverent appeal to God for the truth of what is affirmed. "I have an oath in heaven" --Shak. [1913 Webster] An oath of secrecy for the concealing of those [inventions] which we think fit to keep secret. --Bacon. [1913 Webster] 2. 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. [1913 Webster] 3. (Law) 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. [1913 Webster] 4. 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. "A terrible oath" --Shak. [1913 Webster]