be·troth·al /-ˈtroðəl, ˈtrɔ, θəl/
婚約
Be·troth·al n. The act of betrothing, or the fact of being betrothed; a mutual promise, engagement, or contract for a future marriage between the persons betrothed; betrothment; affiance. “The feast of betrothal.”
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betrothal
n 1: a mutual promise to marry [syn: troth, engagement]
2: the act of becoming betrothed or engaged [syn: espousal]