1. 必需的;必备的;必不可少的
You can use requisite to indicate that something is necessary for a particular purpose.
2. 必需品;必备品;必要条件
A requisite is something which is necessary for a particular purpose.
1. anything indispensable
e.g. food and shelter are necessities of life
the essentials of the good life
allow farmers to buy their requirements under favorable conditions
a place where the requisites of water fuel and fodder can be obtained