| Synonym Collection v1.1 | ||
| Main Entry: | necessary | |
| Part of Speech: | adjective | |
| Synonyms: | alimental, compulsory, contingent, crucial, de rigueur, essential, fundamental, imperative, important, incumbent, indispensable, indispensableinevitable, inevitable, inexorable, inherent, integral, intrinsic, mandatory, needed, needful, obligatory, paramount, perforce, prerequisite, required, requisite, statutory, unavoidable, unpreventable, vital | |
| Antonyms: | casual, discretional, needless, nonessential, optional, unnecessary | |
| Synonym Collection v1.1 | ||
| Main Entry: | necessary | |
| Part of Speech: | noun | |
| Synonyms: | aliment, desideratum, essential, essentiality, exigency, indispensability, necessity, need, obligation, prerequisite, requirement, requisite, sine qua non, subsistence | |
| Synonym Collection v1.1 | ||
| Main Entry: | necessary | |
| Part of Speech: | verb | |
| Synonyms: | behove, entail | |
| Roget's II: The New Thesaurus | ||
| Main Entry: | essential | |
| Part of Speech: | adjective | |
| Definition: | Incapable of being dispensed with. | |
| Synonyms: | indispensable, needful, required, requisite | |
| Roget's II: The New Thesaurus | ||
| Main Entry: | required | |
| Part of Speech: | adjective | |
| Definition: | Imposed on one by authority, command, or convention. | |
| Synonyms: | compulsory, imperative, mandatory, obligatory, requisite | |
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