/ˈklaɪənt ||; ˈklaɪənt/noun[C] 1 somebody who receives a service from a professional person, for example a lawyer （律师等专业人士的）委托人，当事人，客户
2 (computing计算机技术) one of a number of computers that is connected to a special computer(server)that stores shared information 客户机（与储存共享信息的服务器相连接的小型计算机）
Be careful. Client cannot be used for people in shops or restaurants. Those people are customers. Clientele is a general, formal word that includes both clients and customers. 注意：不能用client指商店或餐馆里的顾客。这样的顾客叫做customer。clientele用于正式场合，是client及customer的统称。