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radio

(Encyclopedia)CE5 A. AM transmitter B. AM receiver radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially...

algebra

(Encyclopedia)algebra, branch of mathematics concerned with operations on sets of numbers or other elements that are often represented by symbols. Algebra is a generalization of arithmetic and gains much of its pow...

Congo, river, Africa

(Encyclopedia)Congo zīˈēr, zäērˈ [key], great river of equatorial Africa, c.2,720 mi (4,380 km) long, formed by the waters of the Lualaba River and its tributary, the Luvua River, and flowing generally N and ...

energy

(Encyclopedia)CE5 Relations between potential energy (PE) and kinetic energy (KE) for a swinging pendulum energy, in physics, the ability or capacity to do work or to produce change. Forms of energy include hea...

horse racing

(Encyclopedia)horse racing, trials of speed involving two or more horses. It includes races among harnessed horses with one of two particular gaits, among saddled Thoroughbreds (or, less frequently, quarterhorses) ...

heat

(Encyclopedia)heat, nonmechanical energy in transit, associated with differences in temperature between a system and its surroundings or between parts of the same system. The study of heat and its relationship ...

Raleigh, Sir Walter

(Encyclopedia)Raleigh or Ralegh, Sir Walter both: rŏlˈē, rălˈē [key], 1554?–1618, English soldier, explorer, courtier, and man of letters. Raleigh was made governor of Jersey in 1600, but his fortunes e...

Edward I

(Encyclopedia)Edward I, 1239–1307, king of England (1272–1307), son of and successor to Henry III. Even more important than Edward's military exploits were the legal and constitutional developments of his rei...

Edward III

(Encyclopedia)Edward III, 1312–77, king of England (1327–77), son of Edward II and Isabella. Edward's long reign saw many constitutional developments. Most important of these was the emergence of the Commons ...

hymn

(Encyclopedia)hymn, song of praise, devotion, or thanksgiving, especially of a religious character (see also cantata). Early Christian hymnody consisted mainly of the Psalms and the great canticles Nunc dimittis, M...