Source : Webster's Revised Unabridged Dictionary (1913)

Vow \Vow\, v. t. [imp. & p. p. {Vowed}; p. pr. & vb. n.
   {Vowing}.] [OE. vouen, OF. vouer, voer, F. vouer, LL. votare.
   See {Vow}, n.]
   1. To give, consecrate, or dedicate to God, or to some deity,
      by a solemn promise; to devote; to promise solemnly.
      ``When thou vowest a vow unto God, defer not to pay it.''
      --Eccl. v. 4.

            [Men] that vow a long and weary pilgrimage. --Shak.

   2. To assert solemnly; to asseverate.