n. (pl. oaths)
1. a solemn declaration or undertaking (often naming God) as to the truth of something or as a commitment to future action.
2 a statement or promise contained in an oath (oath of allegiance).
3 a profane or blasphemous utterance; a curse.
Phrases and idioms:
on (or under) oath having sworn a solemn oath. take (or swear) an oath make such a declaration or undertaking.
Etymology: OE ath f. Gmc