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Aragón

(Encyclopedia)Aragón ârˈəgŏn, Span. ärägōnˈ [key], autonomous community, 18,425 sq mi (47,720 sq km), and former kingdom, NE Spain, bordered on the N by France. The city of Z...

explosive

(Encyclopedia)explosive, substance that undergoes decomposition or combustion with great rapidity, evolving much heat and producing a large volume of gas. The reaction products fill a much greater volume than that ...

symbolic logic

(Encyclopedia)symbolic logic or mathematical logic, formalized system of deductive logic, employing abstract symbols for the various aspects of natural language. Symbolic logic draws on the concepts and techniques ...

Gaul

(Encyclopedia)Gaul gôl [key], Lat. Gallia, ancient designation for the land S and W of the Rhine, W of the Alps, and N of the Pyrenees. The name was extended by the Romans to include Italy from Lucca and Rimini no...

Rome, city, Italy

(Encyclopedia)CE5 Roman Empire (a.d. 117) CE5 Rome, Ital. Roma, city (1991 pop. 2,775,250), capital of Italy and see of the pope, whose residence, Vatican City, is a sovereign state within the city of Rome. R...

titles

(Encyclopedia)CE5 titles, terms used to designate degrees of sovereignty, nobility, and honor. In the Muslim world the temporal successors of Muhammad received the title caliph (literally, “successor”). ...

Poland

(Encyclopedia)CE5 Poland, Pol. Polska, officially Republic of Poland, republic (2015 est. pop. 38,265,000), 120,725 sq mi (312,677 sq km), central Europe. It borders on Germany in the west, on the Baltic Sea and...

Alexandria, city, Egypt

(Encyclopedia)Alexandria, Arabic Al Iskandariyah, city, N Egypt, on the Mediterranean Sea. It is at the western extremity of the Nile River delta, situated on a narrow isthmus between the sea and Lake ...

logic

(Encyclopedia)logic, the systematic study of valid inference. A distinction is drawn between logical validity and truth. Validity merely refers to formal properties of the process of inference. Thus, a conclusion w...

diving, deep-sea

(Encyclopedia)diving, deep-sea, act of descending into deep water, generally with some form of breathing apparatus, and remaining there for an extended period. It is used in fishing for sponges, coral, and pearls; ...