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aviation
(Encyclopedia)aviation, operation of heavier-than-air aircraft and related activities. Aviation can be conveniently divided into military aviation, air transport, and general aviation. Military aviation includes al...William II, emperor of Germany and king of Prussia
(Encyclopedia)William II, 1859–1941, emperor of Germany and king of Prussia (1888–1918), son and successor of Frederick III and grandson of William I of Germany and of Queen Victoria of England. After the out...internal-combustion engine
(Encyclopedia) CE5 Internal-combustion engines: In the four-stroke reciprocating engine (above), a mixture of fuel and air is taken into the chamber on the down-stroke of the piston, is compressed on the up-strok...Franco-Prussian War
(Encyclopedia)Franco-Prussian War or Franco-German War, 1870–71, conflict between France and Prussia that signaled the rise of German military power and imperialism. It was provoked by Otto von Bismarck (the Prus...uranium
(Encyclopedia)uranium yo͞orāˈnēəm [key], radioactive metallic chemical element; symbol U; at. no. 92; mass number of most stable isotope 238; m.p. 1,132℃; b.p. 3,818℃; sp. gr. 19.1 at 25℃; valence +3, +4...papacy
(Encyclopedia) CE5 papacy pāˈpəsē [key], office of the pope, head of the Roman Catholic Church. He is pope by reason of being bishop of Rome and thus, according to Roman Catholic belief, successor in the see ...psychoanalysis
(Encyclopedia)psychoanalysis, name given by Sigmund Freud to a system of interpretation and therapeutic treatment of psychological disorders. Psychoanalysis began after Freud studied (1885–86) with the French neu...social security
(Encyclopedia)social security, government program designed to provide for the basic economic security and welfare of individuals and their dependents. The programs classified under the term social security differ f...Triple Alliance and Triple Entente
(Encyclopedia)Triple Alliance and Triple Entente äntäntˈ [key], two international combinations of states that dominated the diplomatic history of Western Europe from 1882 until they came into armed conflict in W...espionage
(Encyclopedia)espionage ĕsˈpēənäzhˌ [key], the act of obtaining information clandestinely. The term applies particularly to the act of collecting military, industrial, and political data about one nation for ...Browse by Subject
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