n.[C]

1. 需要；必需品
   Food is a requirement of life.

   食物是一項生活必需品。

2. 要求；必要條件；規定[（+for）]
   He has filled all requirements for promotion.

   他已具備晉升的一切條件。

n.

1. a thing that is needed or wanted.
2. a thing that is compulsory; a necessary condition.