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The English word essence comes from Latin essentia, via French essence. The original Latin word was created purposefully, by Ancient Roman philosophers, in order to provide an adequate Latin translation for the Greek term ousia.
A definition states the meaning of a word using other words. This is sometimes challenging. Common dictionaries contain lexical descriptive definitions, but there are various types of definition – all with different purposes and focuses. A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols).
Essential services may refer to a class of occupations that have been legislated by a government to have special restrictions in regard to labour actions such as not being allowed to strike. The International Labour Office , a United Nations agency, distinguishes an essential service from a minimum service.
Essentialism is the view that objects have a set of attributes that are necessary to their identity. [1] In early Western thought, Platonic idealism held that all things have such an "essence"—an "idea" or "form".
Essential for almost all living things; needed for chlorophyll, and is a co-factor for many other enzymes; has multiple medical uses. [11] Large doses can have toxic effects. [11] manganese: 25: 5a: Essential for almost all living things, although in very small amounts; it is a cofactor for many classes of enzymes.
In 2002 the definition was changed to: Essential medicines are those that satisfy the priority health care needs of the population. [10] This remains the definition as of 2019. [1] The use of essential medicines lists has resulted in better quality of care and improved management of health resources in the most cost-effective manner.
Boron is essential to plants, [43] [44] [45] but not animals. [6] Non-essential elements can sometimes appear in the body when they are chemically similar to essential elements (e.g. Rb + and Cs + replacing Na +), so that essentiality is not the same thing as uptake by a biological system. [1]
They make up a large part of foods such as rice, noodles, bread, and other grain-based products, [14] [15] but they are not an essential nutrient, meaning a human does not need to eat carbohydrates. [16] Monosaccharides contain one sugar unit, disaccharides two, and polysaccharides three or more.