A lot vs. Alot: 9 Grammatical Pitfalls
c.1300, from Anglo-French and Old French vou, from Latin votum "a vow, wish, promise, dedication," noun use of neuter of votus, past participle of vovere "to promise solemnly, pledge, dedicate, vow," from PIE root *ewegwh- "to speak solemnly, vow" (cf. Sanskrit vaghat- "one who offers a sacrifice;" Greek eukhe "vow, wish," eukhomai "I pray").
c.1300, from Old French vouer, from vou (see vow (n.)). Related: Vowed; vowing.
voluntary promises which, when once made, were to be kept if the thing vowed was right. They were made under a great variety of circumstances (Gen. 28: 18-22; Lev. 7:16; Num. 30:2-13; Deut. 23:18; Judg. 11:30, 39; 1 Sam. 1:11; Jonah 1:16; Acts 18:18; 21:23).
sacred voluntary promise to dedicate oneself or members of one's family or community to a special obligation that goes beyond usual social or religious requirements.