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vector

(Encyclopedia)vector, quantity having both magnitude and direction; it may be represented by a directed line segment. Many physical quantities are vectors, e.g., force, velocity, and momentum. Thus, in specifying a...

time , sequential arrangement of all events

(Encyclopedia)time, sequential arrangement of all events, or the interval between two events in such a sequence. The concept of time may be discussed on several different levels: physical, psychological, philosophi...

Persian art and architecture

(Encyclopedia)Persian art and architecture, works of art and structures produced in the region of Asia traditionally known as Persia and now called Iran. Bounded by fierce mountains and deserts, the high plateau of...

insurance

(Encyclopedia)insurance or assurance, device for indemnifying or guaranteeing an individual against loss. Reimbursement is made from a fund to which many individuals exposed to the same risk have contributed certai...

Arab-Israeli Wars

(Encyclopedia)Arab-Israeli Wars, conflicts in 1948–49, 1956, 1967, 1973–74, and 1982 between Israel and the Arab states. Tensions between Israel and the Arabs have been complicated and heightened by the politic...

agriculture

(Encyclopedia)agriculture, science and practice of producing crops and livestock from the natural resources of the earth. The primary aim of agriculture is to cause the land to produce more abundantly and at the sa...

rubber

(Encyclopedia)CE5 Basic molecules in rubber rubber, any solid substance that upon vulcanization becomes elastic; the term includes natural rubber (caoutchouc) and synthetic rubber. The term elastomer is sometim...

Congo, Republic of the

(Encyclopedia)CE5 Congo, Republic of the, republic (2015 est. pop. 4,996,000), 132,046 sq mi (342,000 sq km), W central Africa; also known as the Congo Republic. Congo is bordered on the west by Gabon; on the no...

feudalism

(Encyclopedia)feudalism fyo͞oˈdəlĭzəm [key], form of political and social organization typical of Western Europe from the dissolution of Charlemagne's empire to the rise of the absolute monarchies. The term fe...

Labour party

(Encyclopedia)Labour party, British political party, one of the two dominant parties in Great Britain since World War I. Harold Wilson, who became leader on Gaitskell's death in 1963, was able to lead the party t...