to conclude a bargain; to promise; appointment; stipulated (time, amount, quality etc); an arrangement; to make an appointment; engagement; commitment; understanding; undertaking; to stipulate; to arrange; stipulation; to agree on sth (after discussion); a deal
（动）经过商量而定下：大家约定去泰山。
事先商定。
《二刻拍案惊奇》卷十七：“ 张氏 送了馆约，约定明年正月元宵后到馆。” 清 李渔 《蜃中楼·耳卜》：“锦鳞儿一对对风流可怪，你在那海当中曾约定两下里和谐。” 巴金 《三次画像》：“我按照约定的时间到他的家。”