| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | necessary |
| Synonyms: | called for, essential, expedient, imperative, important, indispensable, mandatory, necessitous, needful, obligatory, of the essence, required, requisite, vital |
| Notes: | a perquisite is a profit or benefit in addition to a salary or wages or a gratuity or tip for services performed, while a prerequisite is something that is required in advance |
| Antonyms: | optional, unnecessary, voluntary |