INDISPENSABLE
indispensable
(adjective) unavoidable; “the routine but indispensable ceremonies of state”
indispensable
(adjective) not to be dispensed with; essential; “foods indispensable to good nutrition”
essential, indispensable
(adjective) absolutely necessary; vitally necessary; “essential tools and materials”; “funds essential to the completion of the project”; “an indispensable worker”
Source: WordNet® 3.1
Etymology
Adjective
indispensable (comparative more indispensable, superlative most indispensable)
(ecclesiastical, obsolete) Not admitting ecclesiastical dispensation; not subject to release or exemption; that cannot be allowed by bending the canonical rules. [16th-17th c.]
(of duties, rules etc.) Unbendable, that cannot be set aside or ignored. [from 17th c.]
Absolutely necessary or requisite; that one cannot do without. [from 17th c.]
Synonyms
• See also requisite
Antonyms
• dispensable
Noun
indispensable (plural indispensables)
A thing that is not dispensable; a necessity. [from 17th c.]
(in the plural, colloquial, dated) Trousers. [from 19th c.]
Source: Wiktionary
In`dis*pen"sa*ble, a. Etym: [Pref. in- not + dispensable: cf. F.
indispensable.]
1. Not dispensable; impossible to be omitted, remitted, or spared;
absolutely necessary or requisite.
2. (Eccl.)
Definition: Not admitting dispensation; not subject to release or
exemption. [R.]
The law was moral and indispensable. Bp. Burnet.
3. Unavoidable; inevitable. [Obs.] Fuller.
Source: Webster’s Unabridged Dictionary 1913 Edition