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Fermat, Pierre de

(Encyclopedia)Fermat, Pierre de pyĕr də fĕrmäˈ [key], 1601–65, French mathematician. A magistrate whose avocation was mathematics, Fermat is known as a founder of modern number theory and probability theory....

fertilization

(Encyclopedia)CE5 Fertilization of an egg cell fertilization, in biology, process in the reproduction of both plants and animals, involving the union of two unlike sex cells (gametes), the sperm and the ovum, f...

potlatch

(Encyclopedia)potlatch pŏtˈlăchˌ [key], ceremonial feast of the natives of the NW coast of North America, entailing the public distribution of property. The host and his relatives lavishly distributed gifts to ...

revolution

(Encyclopedia)revolution, in a political sense, fundamental and violent change in the values, political institutions, social structure, leadership, and policies of a society. The totality of change implicit in this...

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...

Burgess, John William

(Encyclopedia)Burgess, John William, 1844–1931, American educator and political scientist, b. Tennessee. He served in the Union army in the Civil War and after the war graduated from Amherst (1867). He was admitt...

canon law

(Encyclopedia)canon law, in the Roman Catholic Church, the body of law based on the legislation of the councils (both ecumenical and local) and the popes, as well as the bishops (for diocesan matters). It is the la...

Monteverdi, Claudio

(Encyclopedia)Monteverdi, Claudio klouˈdyō mōntāvĕrˈdē [key], 1567–1643, Italian composer; first great figure in the history of opera. His earliest published works, a set of three motifs, appeared when he ...

López Obrador, Andrés Manuel

(Encyclopedia)López Obrador, Andrés Manuel ändrāsˈ mänwĕlˈ lōˈpĕs ōbrädôrˈ [key], 1954–, Mexican politician, president of Mexico (2018–). A lawyer, he was active in the Institutional Revolutionar...

Mazarin, Jules

(Encyclopedia)Mazarin, Jules zhül mäzärăNˈ [key], 1602–61, French statesman, cardinal of the Roman Catholic Church, b. Italy. His original name was Giulio Mazarini. After serving in the papal army and diplom...