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required

  
  
called for, compulsory, demanded, essential, mandatory, necessary, needed, obligatory, prescribed, recommended, requisite, set, unavoidable, vital  
  
Antonyms     
   elective, noncompulsory, not necessary, not vital, optional, unimportant, voluntary  
English Collins Dictionary - English synonyms & Thesaurus  
Collins

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  
This isn't the kind of crisis that requires us to drop everything else...      V n to-inf  
Some of the materials required for this technique may be difficult to obtain.      V-ed  
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  
At least 35 manufacturers have flouted a law requiring prompt reporting of such malfunctions...      V n  
The law now requires that parents serve on the committees that plan and evaluate school programs...      V that  
Then he'll know exactly what's required of him.      be V-ed of n  
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   v-link PHR, oft PHR for n  
...an important research study that should be required reading for every member of the cabinet.     

Translation English Cobuild Collins Dictionary  

Collaborative Dictionary     English Thesaurus
n.
the actions and activities assigned to or required or expected of a person or group
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