To assert the truth of (something); to affirm (something) with confidence; to declare (something) in a positive manner.
To justify or prove (an allegation or plea that one has made).
To make a vow regarding (something).
To declare publicly that one has made a vow, usually to show one's determination or to announce an act of retaliation.
To make a vow; to promise.
A solemn promise to perform some act, or behave in a specified manner, especially a promise to live and act in accordance with the rules of a religious order.
A declaration or assertion.