noun, noun or participle which takes 'suru', intransitive verb, noun which may take the genitive case particle 'no'
engagement; betrothal
Refers to a formal promise to marry. Used as a noun, with する for the act of getting engaged, and with の to modify nouns (e.g., 婚約指輪, engagement ring).
二人は来月婚約する予定です。
They plan to get engaged next month.
彼女は婚約指
She showed me her engagement ring.