Necessary; obligatory; mandatory.

simple past tense and past participle of require

A necessity or prerequisite; something required or obligatory. Its adpositions are generally of in relation to who or what has given it, on in relation to whom or what it is given to, and for in relation to what is required.

Third-person singular simple present indicative form of require

present participle of require

(archaic) A requirement.

(obsolete) To ask (someone) for something; to request. / To demand, to insist upon (having); to call for authoritatively.

plural of requirement

plural of requiring

plural of requirer