Adjective : INDISPENSABLE
Source: WordNet 3.1
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1. (
) not to be dispensed with; essential; "foods indispensable to good nutrition" ;
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2. (
) absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker" ;
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3. (
) unavoidable; "the routine but indispensable ceremonies of state" ;
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