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1. Oxford Dictionary

   essential

   • IPA[ɪˈsɛnʃl]

   英式

   • adj.
     absolutely necessary; extremely important；fundamental or central to the nature of something or someone
   • n.
     a thing that is absolutely necessary；the fundamental elements or characteristics of something
2. • 釋義

   adj.

   形容詞

   • 1. absolutely necessary; extremely important it is essential to keep up-to-date records fibre is an essential ingredient of our diet 同義詞 crucial, necessary, key, vital, indispensable, ... 更多needed, required, called for, requisite, important, all-important, vitally important, of the utmost importance, of great consequence, of the essence, critical, life-and-death, imperative, mandatory, compulsory, obligatory, compelling, urgent, pressing, burning, acute, paramount, pre-eminent, high-priority, significant, consequential反義詞 inessential, unimportant, optional
   • ▪ fundamental or central to the nature of something or someone the essential weakness of the plaintiff's case 同義詞 basic, inherent, fundamental, quintessential, intrinsic, ... 更多underlying, characteristic, innate, rudimentary, primary, principal, cardinal, chief, elementary, elemental, central, pivotal, critical, key, focal, salient, staple, vital, necessary, indispensable, foundational, ingrained反義詞 secondary
   • ▪ (of an amino acid or fatty acid) required for normal growth but not synthesized in the body and therefore necessary in the diet.
   • 2. (of a disease) with no known external stimulus or cause; idiopathic essential hypertension

   n.

   名詞

   • 1. a thing that is absolutely necessary we only had the bare essentials in the way of equipment 同義詞 necessity, necessary/essential item, prerequisite, requisite, requirement, ... 更多need, condition, precondition, specification, stipulation, qualification, desideratum, sine qua non, informalmust反義詞 inessential
   • ▪ the fundamental elements or characteristics of something he was quick to grasp the essentials of an opponent's argument 同義詞 fundamentals, basics, rudiments, principles, first principles, ... 更多foundations, preliminaries, groundwork, essence, basis, core, kernel, nub, marrow, meat, crux, bedrock, facts, hard facts, practicalities, realities, sine qua non, informalnitty-gritty, brass tacks, nuts and bolts, ABC反義詞 minutiae