a person who has an official position 在职者◆They are looking for a new chief executive, the previous incumbent having left suddenly. 由於前任突然离职，他们正在寻找新的行政总裁。
a company that has a large share of a particular market 主导运营商，市场老大（市场中市场份额大的公司）◆the Swedish telecoms incumbent 瑞典电讯市场的主导运营商