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require  (requires 3rd person present) (requiring present participle) (required past tense & past participle )
1  verb If you require something or if something is required, you need it or it is necessary. 
FORMAL If you require further information, you should consult the registrar...  V n 
2  verb If a law or rule requires you  to  do something, you have to do it. 
FORMAL The rules also require employers to provide safety training...  V n to-inf 
3 If you say that something is required reading for a particular group of people, you mean that you think it is essential for them to read it because it will give them information which they should have. 
required reading  phrase 
...an important research study that should be required reading for every member of the cabinet.