noun A solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise.
take an oath
noun A statement or promise which is strengthened (affirmed) by such a pledge.
After taking the oath of office, she became the country's forty-third premier.
noun A light, irreverent or insulting appeal to a deity or other entity.