Columbia Encyclopedia
Search results
500 results found
free trade
(Encyclopedia)free trade, in modern usage, trade or commerce carried on without such restrictions as import duties, export bounties, domestic production subsidies, trade quotas, or import licenses. The basic argume...lock, canal
(Encyclopedia)lock, canal, stretch of water enclosed by gates, one at each end, built into a canal or river for the purpose of raising or lowering a vessel from one water level to another. A lock may also be built ...aurora borealis
(Encyclopedia)aurora borealis ôstrāˈlĭs [key], luminous display of various forms and colors seen in the night sky. The aurora borealis of the Northern Hemisphere is often called the northern lights, and the aur...Mubarak, Muhammad Hosni
(Encyclopedia)Mubarak, Muhammad Hosni hōsˈnē mo͞obəˈrək [key], 1928–2020, president of Egypt (1981–2011). Air force commander (1972–75) and vice president (1975–81) of Egypt, he became president afte...land use
(Encyclopedia)land use, exploitation of land for agricultural, industrial, residential, recreational, or other purposes. Because the United States historically has a laissez-faire attitude toward land use, the land...warfare
(Encyclopedia)warfare, violent conflict between armed enemies. In modern times warfare has usually been conducted by the armed forces (e.g., army, navy, and air force) of a nation or other politically organized gro...United Presbyterian Church
(Encyclopedia)United Presbyterian Church, two denominations of Presbyterianism. 1 In Scotland, the United Presbyterian Church was formed by the union (1847) of the United Secession Church with the majority of the c...chemical warfare
(Encyclopedia)chemical warfare, employment in war of incendiaries, poison gases, and other chemical substances. Ancient armies attacking or defending fortified cities threw burning oil and fireballs. A primitive ty...helicopter
(Encyclopedia)helicopter, type of aircraft in which lift is obtained by means of one or more power-driven horizontal propellers called rotors. When the rotor of a helicopter turns it produces reaction torque which ...Frederick William IV
(Encyclopedia)Frederick William IV, 1795–1861, king of Prussia (1840–61), son and successor of Frederick William III. A romanticist and a mystic, he conceived vague schemes of reform based on a revival of the m...Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
-
Places
+-
- Africa
- Asia
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-
