I. req ‧ ui ‧ site 1 /ˈrekwəzət, ˈrekwɪzət/ BrE AmE adjective [only before noun] formal
[ Date: 1400-1500 ; Language: Latin ; Origin: past participle of requirere ; ⇨ ↑ require ]
needed for a particular purpose SYN necessary , required :
He lacks the requisite qualifications.
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THESAURUS
▪ necessary used to describe something that you need to have or do:
Make sure you bring the necessary documents with you.
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It may be necessary for you to have a small operation.
▪ essential very important and necessary, especially in order to be healthy, successful etc:
Vitamins are essential for healthy growth.
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The tourist industry is an essential part of the Spanish economy.
▪ vital extremely important and necessary, especially in order to avoid serious problems:
A vital piece of equipment on the spacecraft had stopped operating.
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It is vital that the aid is sent immediately.
▪ compulsory if something is compulsory, you must do it because of a rule or law:
Maths and Science are compulsory subjects.
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All new staff undergo a compulsory training course.
▪ obligatory if something is obligatory, you must do it because of a rule or law. Obligatory is more formal than compulsory :
The use of seatbelts is obligatory.
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Safety regulations have made it obligatory for all competitors to wear fist protectors.
▪ mandatory if something is mandatory, you must do it because it is the law. Mandatory is more formal than compulsory and sounds stronger:
School attendance is mandatory.
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a prisoner serving a mandatory life sentence
▪ requisite /ˈrekwəzət, ˈrekwɪzət/ formal [usually before noun] the requisite things are the ones that you need to have in order to do something:
The other candidates lacked the requisite skills.
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the requisite evidence needed for a successful prosecution
II. requisite 2 BrE AmE noun [countable usually plural]
formal something that is needed for a particular purpose
requisite of/for
He lacked the moral requisites for marriage.
⇨ ↑ prerequisite