| 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 |
| Main Entry: | condition |
| Part of Speech: | noun |
| Definition: | requirement, limitation |
| Synonyms: | arrangement, article, catch, codicil, contingency, demand, essential, exception, exemption, fine print, kicker, modification, must, necessity, postulate, precondition, prerequisite, provision, proviso, qualification, requisite, reservation, rule, sine qua non, small print, stipulation, strings, terms |
| Main Entry: | essential |
| Part of Speech: | adjective |
| Definition: | important, vital |
| Synonyms: | capital, cardinal, chief, constitutive, crucial, foremost, fundamental, imperative, indispensable, leading, main, necessary, necessitous, needed, needful, prerequisite, principal, required, requisite, right-hand, wanted |
| Notes: | the words crucial, essential, and vital cannot be qualified (cannot be more or less...) |
| Antonyms: | accessory, auxiliary, inessential, minor, nonessential, secondary, subsidiary, unimportant |
| Main Entry: | essential |
| Part of Speech: | noun |
| Definition: | necessity, basic |
| Synonyms: | ABCs, bottom line, brass tacks, condition, element, essence, fire and ice, fundamental, groceries, guts*, heart, meat and potatoes, must, name of the game, nitty-gritty, nuts and bolts, part and parcel, precondition, prerequisite, principle, quintessence, requirement, requisite, rudiment, sine qua non, stuff, substance, vital part, where one's at |
| Antonyms: | accessory, auxiliary, nonessential, subsidiary, throwaway, trivia |
| Main Entry: | indispensable |
| Part of Speech: | adjective |
| Definition: | necessary |
| Synonyms: | basal, basic, cardinal, crucial, essential, fundamental, imperative, key, necessitous, needed, needful, prerequisite, primary, required, requisite, vital |
| Antonyms: | dispensable, needless, nonessential, redundant, superfluous, unnecessary |
| Main Entry: | must |
| Part of Speech: | noun |
| Definition: | necessity, essential |
| Synonyms: | charge, commitment, committal, condition, devoir, duty, fundamental, imperative, necessary, need, obligation, ought, precondition, prerequisite, requirement, requisite, right, sine qua non |
| Main Entry: | necessary |
| Part of Speech: | adjective |
| Definition: | essential |
| Synonyms: | all-important, basic, binding, bottom-line, cardinal, chief, compelling, compulsory, crucial, de rigueur, decisive, elementary, exigent, expedient, fundamental, imperative, incumbent on, indispensable, mandatory, momentous, name of game, needed, needful, obligatory, paramount, prerequisite, pressing, prime, principal, quintessential, required, requisite, significant, specified, unavoidable, urgent, vital, wanted |
| Antonyms: | inessential, unimportant, unnecessary, useless |
| Main Entry: | necessity |
| Part of Speech: | noun |
| Definition: | need, essentiality |
| Synonyms: | call, cause, claim, compulsion, demand, desideratum, duress, essence, essential, exaction, exigency, fundamental, godsend, imperative, indispensability, inevitability, inexorableness, life or death, must, necessary, needfulness, no alternative, no choice, obligation, pinch, precondition, prerequisite, privation, requirement, requisite, sine qua non, stress, undeniability, urgency, vital part, vitals, want |
| Antonyms: | desire, want |
| Main Entry: | provision/proviso |
| Part of Speech: | noun |
| Definition: | stipulation, condition of agreement |
| Synonyms: | Catch-22, agreement, catch*, clause, demand, fine print, joker*, kicker, limitation, prerequisite, qualification, requirement, reservation, restriction, rider, small print, specification, stipulation, strings, term, terms |