Definition of "vow"
noun:
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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.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A declaration or assertion.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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To make a vow.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
To declare publicly that one made a vow, usually to show one's determination or to announce an act of retaliation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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