Meaning

noun a solemn pledge (to oneself or to another or to a deity) to do something or to behave in a certain manner

verb make a vow; promise

verb dedicate to a deity by a vow

originInherited from Middle English vowe, voue, that from Old French vut, in turn from Latin vōtum (“a promise, dedication, vow”), from vovēre (“to promise, vow”). Not related to avow. Doublet of vote.

Etymology from Wiktionary, CC BY-SA 3.0