| 单词 | essential |
| 释义 | Word Frequency essential(ɪˈsɛnʃəl) adjective 1. vitally important; absolutely necessary 2. basic; fundamental the essential feature 3. completely realized; absolute; perfect essential beauty 4. biochemistry (of an amino acid or a fatty acid) necessary for the normal growth of an organism but not synthesized by the organism and therefore required in the diet 5. derived from or relating to an extract of a plant, drug, etc an essential oil 6. logic (of a property) guaranteed by the identity of the subject; necessary. Thus, if having the atomic number 79 is an essential property of gold, nothing can be gold unless it has that atomic number 7. music denoting or relating to a note that belongs to the fundamental harmony of a chord or piece 8. pathology (of a disease) having no obvious external cause essential hypertension 9. geology (of a mineral constituent of a rock) necessary for defining the classification of a rock. Its absence alters the rock's name and classification noun 10. something fundamental or indispensable a sharp eye is an essential for a printer 11. music an essential note Derived forms essentiality (ɪˌsɛnʃɪˈælɪtɪ) or essentialness (esˈsentialness) noun |
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