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Adjective: indispensable  ,in-di'spen-su-bul
  1. Not to be dispensed with; essential
    "foods indispensable to good nutrition"
  2. Absolutely necessary; vitally necessary
    "an indispensable worker";
    - essential
  3. Unavoidable
    "the routine but indispensable ceremonies of state"

See also: critical, dispensability, dispensableness, irremissible, necessary, obligatory, vital

Antonym: dispensable

Encyclopedia: Indispensable