requisite

Adjective

• necessary for relief or supply
  • provided them with all things needful
    

Noun

• anything indispensable
  • food and shelter are necessities of life
    
  • the essentials of the good life
    
  • allow farmers to buy their requirements under favorable conditions
    
  • a place where the requisites of water fuel and fodder can be obtained
    

Related words

• Synonyms: 
  needed , needful , required , necessity , essential , requirement , necessary
• Antonyms: 
  inessential , nonessential