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mean

(Encyclopedia) mean, in statistics, a type of average. The arithmetic mean of a group of numbers is found by dividing their sum by the number of members in the group; e.g., the sum of the seven…

solar constant

(Encyclopedia) solar constant, the average amount of radiant energy received by the earth's atmosphere from the sun; its value is about 2 calories per min incident on each square centimeter of the…

Chinguetti

(Encyclopedia) Chinguetti, town, central Mauritania, on the Adrar Plateau east of Atar. Founded in the 8th cent., it was a center on several trans-…

Guðmundsson, Kristmann

(Encyclopedia) Guðmundsson, KristmannGuðmundsson, Kristmannkrĭstˈmän gvüᵺˈmünsôn [key], 1901–83, Icelandic novelist. Guðmundsson lived in Norway from 1924 to 1937 and wrote in both Norwegian and…

galleon

(Encyclopedia) galleon, oceangoing warship used by the European naval powers in the 15th and 16th cent. A large, cumbersome vessel, the galleon was three-masted and square-rigged, usually with two…