How do you spell Betroth

Available Definitions:
1)  v. t. - To contract to any one for a marriage; to engage or promise in order to marriage; to affiance; -- used esp. of a woman.
2)  v. t. - To promise to take (as a future spouse); to plight one's troth to.
3)  v. t. - To nominate to a bishopric, in order to consecration.