essential

essential
[ɪˈsɛnʃ(ə)l]
adjective
  1. absolutely necessary; extremely important
    必不可少的；绝对必要的；非常重要的
    [with infinitive]it is essential to keep up-to-date records.
    适时做好记录是十分必要的。
    fibre is an essential ingredient of our diet.
    纤维是我们饮食中一种很重要的成分。
    ■[attrib.]fundamental or central to the nature of something or someone
    本质的；精髓的，精华的
    the essential weakness of the plaintiff's case.
    原告陈述事实中的本质上的弱点。
    ■(of an amino acid or fatty acid) required for normal growth but not synthesized in the body and therefore necessary in the diet
    （人体生长）所必需的（氨基酸，脂肪酸）
  2. (Medicine)(of a disease) with no known external stimulus or cause; idiopathic
    (医)（疾病）自发的，原发的，特发的
    essential hypertension.
    原发性高血压。
noun
  1. (一般作 essentials)a thing that is absolutely necessary
    必不可少的东西；必需品
    we only had the bare essentials in the way of equipment.
    我们只有最最基本的必需设备。
    ■(essentials)the fundamental elements or characteristics of something
    要素；本质，实质
    he was quick to grasp the essentials of an opponent's argument.
    他能很快抓住对手论证的要旨。
派生
essentiality
noun
essentialness
noun
语源
  1. Middle English (in the sense 'in the highest degree'): from late Latin essentialis, from Latin essentia (see essence)
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