婚約
こんやく · konyaku · JLPT N3 · noun
battle
💍 婚約 = marriage (婚) + promise (約): a promise to marry
婚 means marriage, as in 結婚 (kekkon, wedding). 約 means promise or agreement, as in 約束 (yakusoku, promise). An engagement is a promise of marriage, so 婚約 is the formal word for being engaged.