a feature or quality that is typical of sth 特色；特徵◆Cooperation has been the hallmark of the entire project. 合作是整个项目的特色。◆The award is the hallmark of excellence(= a sign of high quality) for business communication. 奖状是商务沟通做得很卓越的标志。
in the UK, a mark put on a gold, silver or platinum object, showing the quality of the metal and where and when the object was made （金银纯度的）检验印记