• (n.) The act of betrothing, or the state of being betrothed; betrothal.
Be·troth'ment noun The act of betrothing, or the state of being betrothed; betrothal. 
A contract between a man and a woman, by which they agree that at a future, time they will marry together.
Betrothment is a mutual promise or contract between two parties, by which they bind themselves to marry. In ancient times it was attended with the exchanging of rings, joining hands and kissing in the presence of witnesses. Since a betrothment is a contract, it may be subject to litigation.