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acceleration

(Encyclopedia) acceleration, change in the velocity of a body with respect to time. Since velocity is a vector quantity, involving both magnitude and direction, acceleration is also a vector. In…

conducting

(Encyclopedia) conducting, in music, the art of unifying the efforts of a number of musicians simultaneously engaged in musical performance. In the Middle Ages and Renaissance the conductor was…

uncertainty principle

(Encyclopedia) uncertainty principle, physical principle, enunciated by Werner Heisenberg in 1927, that places an absolute, theoretical limit on the combined accuracy of certain pairs of simultaneous…

Barabbas

(Encyclopedia) BarabbasBarabbasbərăbˈəs [key] [Aram.,=son of the father], bandit held in jail at the time of Jesus' arrest. Pontius Pilate, who, according to the Gospels, annually released a prisoner…

Pur

(Encyclopedia) PurPurpûr [key] [Heb.,=lot], in the Bible, lot cast by Haman to determine the time for the murder of the Jews. See Purim.

Liberalia

(Encyclopedia) LiberaliaLiberalialĭbərāˈlēə [key], in Roman religion, festival of Liber and Libera. The rustic festival of great rejoicing and merrymaking was held on Mar. 17. Roman youths generally…

John I, king of Aragón and count of Barcelona

(Encyclopedia) John I, 1350–95, king of Aragón and count of Barcelona (1387–95), son and successor of Peter IV. During his reign Aragón lost (1388) the duchy of Athens. An enthusiastic patron of…

Jaazaniah

(Encyclopedia) JaazaniahJaazaniahjāˌāzənīˈə [key], in the Bible. 1 Head of a number of idolatrous priests whom Ezekiel saw in a vision. 2 Captain active in the politics of Palestine at the time of…

Luton

(Encyclopedia) LutonLutonl&oomacr;ˈtən [key], borough and unitary authority (1991 pop. 163,209), S central England on the Lea River. Hats, automobiles, ball bearings, and aircraft parts are among…

Ozias

(Encyclopedia) OziasOziasōzīˈəs [key] [Gr.,=Heb. Uzziah], in the Bible. 1 Same as Uzziah (1.) 2 Ruler of Bethulia at the time of Judith.