adjective / noun
requisite
REK-wih-zit/ˈrekwɪzɪt/
Necessary for a particular purpose, or something that is needed.
The helmet and harness provide the requisite safety equipment for the climb.

Etymology
The asking or seeking root, with re- perhaps meaning ‘repeatedly,’ underlies a participle meaning ‘asked for.’ What is asked for as needed becomes what circumstances demand: something necessary.
In context
permit me to speak to this gentleman for a moment, for it is requisite I should do so in order to get successfully out of the business in which the boldness of an evil- minded clown has involved me?
More examples
- A valid permit is a requisite for entering the site.
- She lacked the requisite training to operate the machine.
- The guide lists the basic requisites for a safe trip.
Forms
requisite · requisites