"Oath" is a word in LAW AND LEGAL, ENGLISH

An external pledge or assevera-tlon, made in verification of statements made or to be made, coupled with an appeal to a sacred or venerated object, ln evidence of the serious and reverent state of mind of the party, or with an invocation to a su-preme being to witness the words of tiie party and to visit him with punishment if they be faise. See o’Reilly v. People, 86 N. Y. 154, 40 Am. Rep. 525; Atwood v. welton, 7 Conn. 70; Clinton v. State, 33 ohio St. 32; Brock v. Milligan, 10 ohio, 123; Block-er v. Burness, 2 Ala. 354

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 solemn affirmation or declaration, made with a reverent
appeal to God for the truth of what is affirmed.

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.

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.