Essential, indispensable, required.

An indispensable item; a requirement.

plural of requisite

In a requisite way; necessarily.

The state or quality of being requisite.

A formal demand made by one state or government upon another for the surrender or extradition of a fugitive from justice. / (law) A notarial demand for repayment of a debt.

(transitive) To demand something, especially for a military need of staff, supplies, or transport.

plural of requisition

Third-person singular simple present indicative form of requisition

simple past tense and past participle of requisition