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duodecimal system
(Encyclopedia) duodecimal system: see numeration.decimal system
(Encyclopedia) decimal system [Lat.,=of tenths], numeration system based on powers of 10. A number is written as a row of digits, with each position in the row corresponding to a certain power of 10…Ptolemaic system
(Encyclopedia) Ptolemaic systemPtolemaic systemtŏlˌəmāˈĭk, historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the center of…planetary system
(Encyclopedia) planetary system, a star and all the celestial bodies bound to it by gravity, especially planets and their natural satellites. Until the last decade of the 20th cent., the only…portal system
(Encyclopedia) portal system: see circulatory system.reproductive system
(Encyclopedia) CE5 Reproductive system reproductive system, in animals, the anatomical organs concerned with production of offspring. In humans and other mammals the female reproductive system…respiratory system
(Encyclopedia) respiratory system: see respiration.Continental System
(Encyclopedia) Continental System, scheme of action adopted by Napoleon I in his economic warfare with England from 1806 to 1812. Economic warfare had been carried on before 1806, but the system…cooling system
(Encyclopedia) cooling system: see air conditioning; internal-combustion engine; refrigeration.Copernican system
(Encyclopedia) Copernican system, first modern European theory of planetary motion that was heliocentric, i.e., that placed the sun motionless at the center of the solar system with all the planets,…Trending
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