prerequisite

prerequisite
[priːˈrɛkwɪzɪt]
noun
  1. a thing that is required as a prior condition for something else to happen or exist
    先决条件,前提;必备条件
    sponsorship is not a prerequisite for any of our courses.
    赞助并不是我们任何课程的前提。
adjective
  1. required as a prior condition
    必要的,先决条件的,必须预先具备的
    the student must have the prerequisite skills.
    学生必须有事先要求的技术。
英语宝典
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