Required by the nature of things, or by circumstances; so needful that it can not be dispensed with; necessary; indispensable.
source: Webster 1913
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.
source: WordNet 3.0
That which is required, or is necessary; something indispensable.
