1. （用于头衔或职务前，表示级别略低）助理的，副的
    Assistant is used in front of titles or jobs to indicate a slightly lower rank. For example, an assistant director is one rank lower than a director in an organization.

    e.g. ...the Assistant Secretary of Defense.
           助理国防部长
    e.g. ...a young assistant professor at Harvard.
           年轻的哈佛助理教授

2. 助手;助理;副手
    Someone's assistant is a person who helps them in their work.

assistant什么意思

    e.g. Kalan called his assistant, Hashim, to take over while he went out...
           考兰叫助理哈希姆在自己外出时代理其职。
    e.g. The salesman had been accompanied to the meeting by an assistant.
           营销人员在助手的陪同下参加了会议。

3. 店员；售货员
    An assistant is a person who works in a shop selling things to customers.

assistant的反义词

    e.g. The assistant took the book and checked the price on the back cover...
           店员拿起书，核对了一下封底的定价。
    e.g. She got a job as a sales assistant selling handbags.
           她得到了一份手提包售货员的工作。