essential

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essential

1. Biochem (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
2. derived from or relating to an extract of a plant, drug, etc.
3. 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
4. Music denoting or relating to a note that belongs to the fundamental harmony of a chord or piece
5. Pathol (of a disease) having no obvious external cause
6. 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
7. Music an essential note
References in classic literature ?
In essentials, I believe, he is very much what he ever was.
But we Folk of the Younger World lacked speech, and whenever we were so drawn together we precipitated babel, out of which arose a unanimity of rhythm that contained within itself the essentials of art yet to come.
Second, I suggest that all men and women, and boys and girls, who have so acquainted themselves with the essentials of the fine art of animal-training, should become members of, and ally themselves with, the local and national organizations of humane societies and societies for the prevention of cruelty to animals.
and the first three essentials of the literary art are imagination,
The essentials of this affair lay deep under the surface, beyond my reach, and beyond my power of meddling.
Little circumstances, which were perhaps accidental in a great author, were by these critics considered to constitute his chief merit, and transmitted as essentials to be observed by all his successors.
Luker believed the story to be, as to all main essentials, true--on this ground, that Mr.
As for the story itself it is true enough in its essentials.
Ensconced cosily behind the shop of doubtful wares, with the mysteriously dim window, and its door suspiciously ajar in the obscure and narrow street, it was in all essentials of domestic propriety and domestic comfort a respectable home.
That man had been in all essentials but his age just such another man as myself.
We have every where endeavoured to show that while Mahtoree was in all essentials a warrior of the prairies, he was much in advance of his people in those acquirements which announce the dawnings of civilisation.
and even admitting that he knew he had some of the essentials of a gentleman .