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How to sign: absolutely necessary; vitally necessary
"essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker";
Similiar / Same: indispensable
How to sign: 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";