indispensable
1. not to be dispensed with; essential (Freq. 2) - foods indispensable to good nutrition • Ant: dispensable • Similar to: critical, vital • See Also: necessary • Derivationally related forms: indispensableness, indispensability • Attrubites: dispensability, dispensableness 2. absolutely necessary; vitally necessary (Freq. 1) - essential tools and materials - funds essential to the completion of the project - an indispensable worker • Syn: essential • Similar to: necessary • Derivationally related forms: indispensableness, indispensability, essential (for: essential), essentialness (for: essential) 3. unavoidable - the routine but indispensable ceremonies of state • Similar to: obligatory
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