| necessity | | |
| necessity | (n.) | the condition of being essential or indispensable. |
| essential, necessary, necessity, requirement, requisite | (n.) | anything indispensable.; "food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained" |
| requisite | | |
| needed, needful, required, requisite | (adj.) | necessary for relief or supply.; "provided them with all things needful" |
| necessary | | |
| necessary | (adj.) | absolutely essential. |
| necessary | (adj.) | unavoidably determined by prior circumstances.; "the necessary consequences of one's actions" |
| imperative | | |
| imperative, imperative form, imperative mood, jussive mood | (n.) | a mood that expresses an intention to influence the listener's behavior. |
| imperative | (n.) | some duty that is essential and urgent. |
| imperative | (adj.) | requiring attention or action.; "as nuclear weapons proliferate, preventing war becomes imperative"; "requests that grew more and more imperative" |
| imperative | (adj.) | relating to verbs in the imperative mood. |
| essential | | |
| essential, indispensable | (adj.) | absolutely necessary; vitally necessary.; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker" |
| essential | (adj.) | basic and fundamental.; "the essential feature" |
| all important, all-important, crucial, essential, of the essence | (adj.) | of the greatest importance.; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence" |
| essential | (adj.) | being or relating to or containing the essence of a plant etc.; "essential oil" |
| essential, substantive | (adj.) | defining rights and duties as opposed to giving the rules by which rights and duties are established.; "substantive law" |
| mandatory | | |
| mandatary, mandatory | (n.) | the recipient of a mandate. |
| mandate, mandatory | (n.) | a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves. |
| compulsory, mandatory, required | (adj.) | required by rule.; "in most schools physical education is compulsory"; "attendance is mandatory"; "required reading" |
| must | | |
| must | (n.) | a necessary or essential thing.; "seat belts are an absolute must" |
| must | (n.) | grape juice before or during fermentation. |
| moldiness, must, mustiness | (n.) | the quality of smelling or tasting old or stale or mouldy. |
| must | (adj.) | highly recommended.; "a book that is must reading" |
| require | | |
| ask, call for, demand, involve, necessitate, need, postulate, require, take | (v.) | require as useful, just, or proper.; "It takes nerve to do what she did"; "success usually requires hard work"; "This job asks a lot of patience and skill"; "This position demands a lot of personal sacrifice"; "This dinner calls for a spectacular dessert"; "This intervention does not postulate a patient's consent" |
| ask, expect, require | (v.) | consider obligatory; request and expect.; "We require our secretary to be on time"; "Aren't we asking too much of these children?"; "I expect my students to arrive in time for their lessons" |
| command, require | (v.) | make someone do something. |
| need, require, want | (v.) | have need of.; "This piano wants the attention of a competent tuner" |
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