required :: Lexipedia - Where words have meaning

adj. required or under orders; "I'm supposed to be there at ten"; "he was supposed to go to the store"

adj. required by rule; "in most schools physical education is compulsory"; "attendance is mandatory"; "required reading"

requisite, needed, needful

adj. necessary for relief or supply; "provided them with all things needful"

necessary

adj. absolutely essential

requisite, required, needed, needful

adj. necessary for relief or supply; "provided them with all things needful"

imperative

adj. requiring attention or action; "as nuclear weapons proliferate, preventing war becomes imperative"; "requests that grew more and more imperative"

certain, sure, ineluctable, inescapable, unavoidable

adj. impossible to avoid or evade:"inescapable conclusion"; "an ineluctable destiny"; "an unavoidable accident"

certain, sure

adj. having or feeling no doubt or uncertainty; confident and assured; "felt certain of success"; "was sure (or certain) she had seen it"; "was very sure in his beliefs"; "sure of her friends"

mandatory, compulsory, required

adj. required by rule; "in most schools physical education is compulsory"; "attendance is mandatory"; "required reading"

essential

adj. basic and fundamental; "the essential feature"

imperative

adj. requiring attention or action; "as nuclear weapons proliferate, preventing war becomes imperative"; "requests that grew more and more imperative"

invaluable, priceless

adj. having incalculable monetary, intellectual, or spiritual worth

essential, crucial, all-important, all important, of the essence

adj. of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"

beholden

adj. under a moral obligation to someone

indebted

adj. owing gratitude or recognition to another for help or favors etc

bound, obligate, constrained, compelled

adj. being under moral or legal obligation

duty-bound, obliged

adj. under a moral obligation to do something

indebted

adj. under a legal obligation to someone

bounden

adj. morally obligatory; "my bounden duty"

de rigueur

adj. required by etiquette or usage or fashion; "instruction as to when and where a silk hat is de rigueur"

incumbent on

adj. morally binding or necessary; "it is incumbent on me to attend"

prerequisite

adj. required as a prior condition or course of study

essential, indispensable

adj. absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"

obligatory

adj. required by obligation or compulsion or convention; "he made all the obligatory apologies"

optional

adj. possible but not necessary; left to personal choice

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