necessity necessity /nəˈsɛsɪti/

noun

1. () The condition of being essential or indispensable  ( necessity )
   the condition of being essential or indispensable
     Food, water, and shelter are basic necessities for survival.
   Food, water, and shelter are basic necessities for survival.
   
2. () Anything indispensable  ( necessary , requisite , essential , necessity , requirement )
   anything indispensable
    Food and shelter are necessities of life
   food and shelter are necessities of life
    The essentials of the good life
   the essentials of the good life
    Allow farmers to buy their requirements under favorable conditions
   allow farmers to buy their requirements under favorable conditions
    A place where the requisites of water fuel and fodder can be obtained
   a place where the requisites of water fuel and fodder can be obtained