- necessary
- I(Roget's IV) modif.1. [Essential]Syn. essential, requisite, expedient, needful, indispensable, needed, required, urgent, wanted, imperative, prerequisite, exigent, pressing, vital, cardinal, fundamental, significant, momentous, compulsory, mandatory, basic, paramount, obligatory, essential, compelling, incumbent on, incumbent upon, all-important, nuts-and-bolts, binding, specified, unavoidable, decisive, crucial, elementary, quintessential, chief, principal, prime, intrinsic, fixed, constant, permanent, determinate, inherent, ingrained, innate, without choice, without appeal; see also important 1 .Ant. unimportant*, unessential, insignificant.2. [Inevitable]II(Roget's 3 Superthesaurus) a.essential, vital, needed, required, called for, requisite, prerequisite, mandatory, imperative, compulsory, fundamental, obligatory.ANT.: unnecessary, unneeded, unessentialIII(Roget's Thesaurus II) adjective 1. Incapable of being dispensed with: essential, indispensable, needful, required, requisite. See IMPORTANT, NECESSARY. 2. Imposed on one by authority, command, or convention: compulsory, imperative, mandatory, obligatory, required, requisite. See OBLIGATION.
English dictionary for students. 2013.