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Possible definitions for vacua

vacuum
Space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal). A vacuum can be created by removing air from a space using a vacuum pump or by reducing the pressure using a fast flow of fluid, as in Bernoulli's principle.


actuary
One who calculates insurance risks and premiums. Actuaries compute the probability of the occurrence of such events as birth, marriage, illness, accidents, and death. They also evaluate the hazards of property damage or loss and the legal liability for the safety and well-being of others. Usually employed by insurance companies, actuaries set premium rates based on statistical studies, establish underwriting procedures, and determine the amounts of money required to assure the payment of benefits.


Dachau
First Nazi concentration camp in Germany, established in 1933. It became the model and training center for all other SS-organized camps. In World War II the main camp was supplemented by about 150 branches in S Germany and Austria, which were collectively called Dachau. It was the first and most important camp at which laboratories were set up to perform medical experiments on inmates. Such experiments and the harsh living conditions made Dachau one of the most notorious camps, though it was not designed as an extermination camp.


Dacia
Ancient country, central Europe. Roughly equivalent to modern Romania, the area's earliest known inhabitants were Getae and Dacian people of Thracian stock. Known for its rich silver, iron, and gold mines, the region was made a Roman province in AD 107 after two centuries of hostilities. It was abandoned to the Goths in 270 and ultimately divided into the principalities of Walachia and Moldavia.


jackal
Any of three canine species of the genus Canis. They inhabit open country and live alone, in pairs, or in packs. They hunt at night, feeding on small animals, plant material, or carrion. A pack can bring down larger prey. The golden, or Asiatic, jackal (yellowish) is found from E Europe and NE Africa to SE Asia. The black-backed jackal (rusty red with a black back) and side-striped jackal (grayish with a white-tipped tail and an indistinct stripe on each side) are found in S and E Africa. Jackals are 34-37 in. (85-95 cm) long, incl. the 12-14-in. (30-35-cm) tail, and weigh 15-24 lbs (7-11 kg).


jaguar
Largest New World cat. Once found in wooded regions from the U.S.-Mexican border south to Patagonia, the jaguar (Panthera, or Leo, onca) survives, in reduced numbers, only in remote areas of S. America; the largest known population is in the Amazon rain forest. The male is 5.5-9 ft (1.7-2.7 m), incl. the 23-35-in. (60-90-cm) tail, and weighs 220-350 lbs (100-160 kg). The coat is ...

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