Bible Dictionary · B
Betroth
To promise “by one’s truth.” Men and women were betrothed when they were engaged to be married. This usually took place a year or more before marriage. From the time of betrothal the woman was regarded as the lawful wife of the man to whom she was betrothed (Deut 28:30; Judg 14:2, Judg 14:8; Matt 1:18–21). The term is figuratively employed of the spiritual connection between God and his people (Hos 2:19, Hos 2:20).
From Easton’s Bible Dictionary (1897), by Matthew George Easton.