1. Absolutely necessary; essential.
2. Obligatory; unavoidable: the routine but indispensable ceremonies of state.
One that is indispensable.
in′dis·pens′a·bili·ty, in′dis·pensa·ble·ness n.
Synonyms: indispensable, critical, essential, necessary, requisite
These adjectives apply to something that cannot be dispensed with: foods that are indispensable to good nutrition; education that is critical to success; funds essential to completing the project; the necessary tools for the job; lacking the requisite qualifications for the position.
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