Definition of "indispensable" in English

adjective

1. Absolutely necessary or requisite; that one cannot do without.

   • An indispensable component of a heart-healthy diet.

2. (of duties, rules etc.) Unbendable, that cannot be set aside or ignored.

3. (ecclesiastical, obsolete) Not admitting ecclesiastical dispensation; not subject to release or exemption; that cannot be allowed by bending the canonical rules.

noun

1. A thing that is not dispensable; a necessity.

2. (in the plural, colloquial, dated) Trousers.