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reservoir

(Encyclopedia)reservoir rĕzˈəvôr, –vwär [key], storage tank or wholly or partly artificial lake for storing water. Building an embankment or dam to preserve a supply of water for irrigation is an ancient pra...

mutation

(Encyclopedia)mutation, in biology, a sudden, random change in a gene, or unit of hereditary material, that can alter an inheritable characteristic. Most mutations are not beneficial, since any change in the delica...

alimony

(Encyclopedia)alimony, in law, allowance for support that an individual pays to his or her former spouse, usually as part of a divorce settlement. It is based on the common law right of a wife to be supported by he...

dark energy

(Encyclopedia)dark energy, repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate. The search for dark energy was triggered by the discov...

committee

(Encyclopedia)committee, one or more persons appointed or elected to consider, report on, or take action on a particular matter. Because of the advantages of a division of labor, legislative committees of various k...

field, in physics

(Encyclopedia)field, in physics, region throughout which a force may be exerted; examples are the gravitational, electric, and magnetic fields that surround, respectively, masses, electric charges, and magnets. The...

hydrolysis

(Encyclopedia)hydrolysis hīdrŏlˈĭsĭs [key], chemical reaction of a compound with water, usually resulting in the formation of one or more new compounds. The most common hydrolysis occurs when a salt of a weak ...

hysteresis

(Encyclopedia)hysteresis hĭsˌtərēˈsĭs [key], phenomenon in which the response of a physical system to an external influence depends not only on the present magnitude of that influence but also on the previous...

Hoffa, Jimmy

(Encyclopedia)Hoffa, Jimmy (James Riddle Hoffa) hôfˈə [key], 1913–75?, U.S. labor leader, b. Brazil, Indiana. As a young warehouseman he organized (1932) a union that was admitted two years later into the Team...

modernism

(Encyclopedia)modernism, in religion, a general movement in the late 19th and 20th cent. that tried to reconcile historical Christianity with the findings of modern science and philosophy. Modernism arose mainly fr...