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zero

(Encyclopedia)zero, that number which, when added to any number, leaves the latter unchanged; its symbol is 0. The introduction of zero into the decimal system was the most significant achievement in the developmen...

Uralic and Altaic languages

(Encyclopedia)Uralic and Altaic languages yo͝orălˈĭk, ăltāˈĭk [key], two groups of related languages thought by many scholars to form a single Ural-Altaic linguistic family. However, other authorities hold ...

gar

(Encyclopedia)gar, member of the family Lepisosteidae, freshwater fishes found in the warmer rivers and lakes of the S United States, Central America, Mexico, and the West Indies. Gars are highly predacious and des...

Little Rock Central High School National Historic Site

(Encyclopedia)Little Rock Central High School National Historic Site: see National Parks and Monuments (table)national parks and monuments (table). ...

Itzamna

(Encyclopedia)Itzamna ētsämˈnä [key], chief deity of the Maya. Son of Hunab Ku, the creator, he was believed to be lord of the heavens, day, and night. Thought by the Maya to have been the inventor of writing a...

extroversion and introversion

(Encyclopedia)extroversion and introversion, terms introduced into psychology by Carl Jung to identify opposite psychological types. Jung saw the activity of the extrovert directed toward the external world and tha...

migration of animals

(Encyclopedia)migration of animals, movements of animals in large numbers from one place to another. In modern usage the term is usually restricted to regular, periodic movements of populations away from and back t...

Álvarez, Juan

(Encyclopedia)Álvarez, Juan hwän älˈvärās [key], 1780–1867, Mexican general of indigenous descent, president of Mexico (1855). He distinguished himself in battle under Morelos y Pavón and was later the fir...

Mackenzie, Sir Alexander, Canadian fur trader and explorer

(Encyclopedia)Mackenzie, Sir Alexander, 1764?–1820, Canadian fur trader and explorer, b. Scotland. His family took him to the colony of New York in 1774, and later he was sent to Canada. He entered (c.1779) a Mon...

American Academy and Institute of Arts and Letters

(Encyclopedia)American Academy and Institute of Arts and Letters, honorary academy of notable American artists, writers, and composers. The National Institute of Arts and Letters, founded in 1898, served as the par...