definition of
necessity

[1] #1 necessity n. the condition of being essential or indispensable. wn

[2] #2 necessity n. [essential, requirement, requisite, necessary] 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". wn