Vow

1. n. Specifically, a promise of fidelity; a pledge of love or affection; as, the marriage vow.
2. n. 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.
3. n. To assert solemnly; to asseverate.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.