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1 : a solemn attestation of the truth of one's words or the sincerity of one's intentions
: one accompanied by calling upon a deity as a witness
2 : a promise (as to perform official duties faithfully) corroborated by an oath compare perjury
: under a solemn and esp. legal obligation to tell the truth (as when testifying)
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.