
Essentialism is the view that, for any specific entity (such as an animal, a group of people, a physical object, a concept), there is a set of attributes which are necessary to its identity and function. In Western thought the concept is found in the work of Plato and Aristotle. Platonic idealism is the earliest known theory of how all known thing...
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http://en.wikipedia.org/wiki/Essentialism

doctrine that things have real essences that can be discovered
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http://phrontistery.info/e.html

the belief that qualities are inherent in (essential to) specific objects
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http://wps.pearsoned.co.uk/wps/media/objects/2143/2195136/glossary/glossary

(from the article `Kripke, Saul`) ...truth and synthetic truth, or truth by virtue of meaning and truth by virtue of fact ( analytic proposition). In the course of making these ...
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http://www.britannica.com/eb/a-z/e/46

is most commonly understood as a belief in the real, true essence of things, the invariable and fixed properties which define the 'whatness' of a given entity. . . . Importantly, essentialism is typically defined in opposition to difference. . . . The opposition is a helpful one in that it reminds us that a complex system of cultural, social, psych...
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http://www.encyclo.co.uk/local/20164

the view that there are invariant truths about the social world or that social phenomena are determined by an invariant core of properties. Essentialist theories are usually counterposed to those that stress the changeable quality of social phenomena. For example, essentialist theories of identity suggest that people have an invariant core of selfh...
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http://www.polity.co.uk/cbs3/PDF/Glos.pdf

the belief and practice centered on a philosophical claim that for any specific kind of entity it is at least theoretically possible to specify a finite list of characteristics, all of which any entity must have to belong to the group defined.
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the idea that people, objects, and ideas can be identified based on externally observable features. Although this is empirically true, social justice warriors consider this idea to be problematic.
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http://www.zerothposition.com/2016/03/30/a-glossary-of-social-justice-warri

a doctrine that certain traditional concepts, ideals, and skills are essential to society and should be taught methodically to all students, regardless of individual ability, need, etc. Cf. progressivism.
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https://www.infoplease.com/dictionary/essentialism
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