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Definition of vow : 1. A solemn promise made to God, or to some deity; an act by which one consecrates or devotes himself, absolutely or conditionally, wholly or in part, for a longer or shorter time, to some act, service, or condition; a devotion of one's possessions; as, a baptismal vow; a vow of poverty.
2. Specifically, a promise of fidelity; a pledge of love or affection; as, the marriage vow.
3. To assert solemnly; to asseverate.
4. To give, consecrate, or dedicate to God, or to some deity, by a solemn promise; to devote; to promise solemnly.
5. To make a vow, or solemn promise.

Synonyms:

ordinate, reprobation, adjuration, sanctify, ordain, word, devote, dedicate, ban, give, profane swearing, execration, imprecation, malediction, solemn word, guaranty, hallow, commit, consecrate, word of honor, denunciation, affidavit, warrant, anathema, blasphemy, blaspheming, plight, order, sworn statement, cursing, curse, profanity, bless, swearing

mutual agreement, agree, promise, consent, stipulate, engagement, compact, understanding, pledge, agreement, solemn assertion, obligation, affiance, oath, assurance, asseveration, contract, guarantee, stipulation, covenant, pact, swear, bond, arrangement, assure

Usage examples:

• The king had taken a vow to build a city and to erect a fire temple at the place where he had defeated his enemy. - "Iranian Influence on Moslem Literature, Part I", M. Inostranzev.
• I've kept that vow. - "Lefty Locke Pitcher-Manager", Burt L. Standish.
• Second, That the oath is distinct from the vow. - "The Ordinance of Covenanting", John Cunningham.