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chemistry

(Encyclopedia)chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

Middle English literature

(Encyclopedia)Middle English literature, English literature of the medieval period, c.1100 to c.1500. See also English literature and Anglo-Saxon literature. The 15th cent. is not distinguished in English let...

electricity

(Encyclopedia)CE5 Electrical and radio symbols electricity, class of phenomena arising from the existence of charge. The basic unit of charge is that on the proton or electron—the proton's charge is designate...

tenure, in law

(Encyclopedia)tenure, in law, manner in which property in land is held. The nature of tenure has long been of great importance, both in law and in the broader economic and political context. Tenure has varied great...

American literature

(Encyclopedia)American literature, literature in English produced in what is now the United States of America. The years immediately after World War I brought a highly vocal rebellion against established socia...

England, Church of

(Encyclopedia)England, Church of, the established church of England and the mother church of the Anglican Communion. In the first half of the 19th cent., the Catholic and apostolic character of the Church of Engl...

scene design and stage lighting

(Encyclopedia)scene design and stage lighting, settings and illumination designed for theatrical productions. See also drama, Western; Asian drama; theater; directing; acting. Scene designers in the early 20th ce...

Oklahoma

(Encyclopedia)CE5 Oklahoma ōkləhōˈmə [key], state in SW United States. It is bordered by Missouri and Arkansas (E); Texas, partially across the Red River (S, W); New Mexico, across the narrow edge of the Ok...

element

(Encyclopedia)CE5 element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means o...

Sierra Leone

(Encyclopedia)CE5 Sierra Leone sēĕrˈə lēōˈnē, lēōnˈ; sērˈə lēōn [key], officially Republic of Sierra Leone, republic (2015 est. pop. 5,879,000), 27,699 sq mi (71,740 sq km), W Africa. It is borde...