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lepton

(Encyclopedia)lepton lĕpˈtŏnˌ [key] [Gr.,=light (i.e., lightweight)], class of elementary particles that includes the electron and its antiparticle, the muon and its antiparticle, the tau and its antiparticle, ...

marine engine

(Encyclopedia)marine engine, machine for the propulsion of watercraft. The earliest marine power plants, reciprocating steam engines, were used almost exclusively until the early 1900s. In later ship construction t...

Fukushima

(Encyclopedia)Fukushima fo͝oko͞oˈshĭmä [key], city, capital of Fukushima prefecture, N Honshu, Japan, on the Kiso ...

safety movement

(Encyclopedia)safety movement, widespread effort to prevent accidents that followed the increasing number of casualties in industry, traffic and transportation, and homes arising out of the Industrial Revolution an...

General Agreement on Tariffs and Trade

(Encyclopedia)General Agreement on Tariffs and Trade (GATT), former specialized agency of the United Nations. It was established in 1948 as an interim measure pending the creation of the International Trade Organiz...

balance of power

(Encyclopedia)balance of power, system of international relations in which nations seek to maintain an approximate equilibrium of power among many rivals, thus preventing the preponderance of any one state. Crucial...

Massawa

(Encyclopedia)Massawa məsäˈwə [key], city (1984 pop. 15,441), Eritrea, a port on the Red Sea. Before Eritrean independence (1993) it was the main port for N Ethiopia and is linked by rail with Asmara. Agreement...

Gary, Elbert Henry

(Encyclopedia)Gary, Elbert Henry, 1846–1927, American lawyer and industrialist, b. near Wheaton, Ill., grad. Union College of Law, Chicago, 1868. Rising rapidly as a corporation lawyer, he became mayor of Wheaton...

Aix-la-Chapelle, Treaty of

(Encyclopedia)Aix-la-Chapelle, Treaty of ĕks-lä-shäpĕlˈ [key]. 1 Compact of May 2, 1668, that ended the French invasion of the Spanish Netherlands (see Devolution, War of). France kept most of its conquests in...

Ogaden

(Encyclopedia)Ogaden ōgäˈdān [key], region, SE Ethiopia, bordering on Somalia. It is an arid region, inhabited mainly by Somali pastoral nomads. The region was conquered by Menelik II of Ethiopia in 1891. A cla...