1Engagement or betrothal — the promise, or the resulting status, of two people planning to marry. Also used in expressions like 婚約指輪 ("engagement ring").
彼らは婚約を発表した。
They announced their engagement.
兄が婚約して、家族でお祝いした。
My older brother got engaged and our family celebrated.
婚約指輪を選ぶのは楽しかった。
Choosing the engagement ring was fun.