1. (在组织或专业领域中)级别高的，资深的
    The senior people in an organization or profession have the highest and most important jobs.

    e.g. ...senior officials in the Israeli government.
           以色列政府的高级官员
    e.g. ...the company's senior management...
           公司的高级管理层

2. 职位高于…的;资格比…老的;更资深的
    If someone is senior to you in an organization or profession, they have a higher and more important job than you or they are considered to be superior to you because they have worked there for longer and have more experience.

senior

    e.g. The position had to be filled by an officer senior to Haig...
           这个位置必须由一个职位高于黑格的官员来担任。
    e.g. Williams felt himself to be senior to all of them.
           威廉斯自认为比他们所有人资格都要老。

3. 较年长的人;比…大…岁的人
    Senior is used when indicating how much older one person is than another. For example, if someone is ten years your senior, they are ten years older than you.

senior的近义词

    e.g. She became involved with a married man many years her senior.
           她和一个比自己大很多岁的已婚男子好上了。

4. (中学或大学里的)高年级学生，毕业班学生
    Seniors are students in a high school, university, or college who are the oldest and who have reached an advanced level in their studies.

5. (比赛)成人的，高水平的
    If you take part in a sport at senior level, you take part in competitions with adults and people who have reached a high degree of achievement in that sport.

    e.g. This will be his fifth international championship and his third at senior level.
           这将是他第五个世界冠军，第三个成人级别赛事的冠军。

6. (高尔夫、网球等体育运动中的)年长的运动员，资深运动员
    In sports such as golf and tennis, a senior is a professional player who is fairly old and who plays in special competitions against other older players.