1. （需要高等教育或训练的）职业
    A profession is a type of job that requires advanced education or training.

    e.g. Harper was a teacher by profession...
           哈珀的职业是教师。
    e.g. Only 20 per cent of jobs in the professions are held by women.
           在这些职业中，只有20%的岗位是由女性担任的。

2. （某一专业工作的）全体人员，业界人士，专业界
    You can use profession to refer to all the people who have the same profession.

    e.g. The attitude of the medical profession is very much more liberal now.
           现在，医务人员的态度开明多了。