ABCDEFGHIJKLMNOPQRSTUVWXYZ0-9
agglutination ... Agramonte y Simoni, Aristides
agglutination
a grammatical process in which words are composed of a sequence of morphemes (meaningful word elements), each of which represents not more than a single grammatical category. This term is traditionally employed in the typological classification of languages. Turkish, Finnish, and Japanese are among the languages that form words by ...
agglutinin
substance that causes particles to congeal in a group or mass, particularly a typical antibody that occurs in the blood serums of immunized and normal human beings and animals. When an agglutinin is added to a uniform suspension of particles (such as bacteria, protozoa, or red cells) that contains the ...
aggregate
in building and construction, material used for mixing with cement, bitumen, lime, gypsum, or other adhesive to form concrete or mortar. The aggregate gives volume, stability, resistance to wear or erosion, and other desired physical properties to the finished product. Commonly used aggregates include sand, crushed or broken stone, gravel ...
aggression
in international relations, an act or policy of expansion carried out by one state at the expense of another by means of an unprovoked military attack. For purposes of reparation or punishment after hostilities, aggression has been defined in international law as any use of armed force in international relations ...
aggressive behaviour
animal behaviour that involves actual or potential harm to another animal. Biologists commonly distinguish between two types of aggressive behaviour: predatory or antipredatory aggression, in which animals prey upon or defend themselves from other animals of different species, and intraspecific aggression, in which animals attack members of their own species. ...
aggressive mimicry
a form of similarity in which a predator or parasite gains an advantage by its resemblance to a third party. This model may be the prey (or host) species itself, or it may be a species that the prey does not regard as threatening. An example in which the prey ...
Aggtelek Caves
limestone cave system on the Hungarian-Slovakian border, about 30 miles (50 km) northwest of Miskolc, Hungary, and 40 miles (65 km) southwest of Kosice, Slovakia. It is the largest stalactite cave system in Europe, and its stalactite and stalagmite formations are spectacular. The caverns and their surroundings have been designated ...
Agha Mohammad Khan
founder and first ruler of the Qajar dynasty of Iran. Following the disintegration of the Safavid empire in 1722, Qajar tribal chieftains became prominent in Iranian affairs.
Aghlabid dynasty
Arab Muslim dynasty that ruled Ifriqiyah (Tunisia and eastern Algeria) from AD 800 to 909. The Aghlabids were nominally subject to the 'Abbasid caliphs of Baghdad but were in fact independent. Their capital city was Kairouan (al-Qayrawan), in Tunisia. The most interesting of the 11 Aghlabid emirs were the energetic ...
Agin Buryat
former autonomous okrug (district), southeastern Russia; in 2008 it merged with Chita oblast (region) to form Zabaykalye kray (territory). The Agin Buryat area is situated along the left bank of the lower Onon River, a headstream of the Amur. The district was formed in 1937 for an exclave group of ...
Agincourt, Battle of
(Oct. 25, 1415), decisive victory of the English over the French in the Hundred Years' War.
aging
progressive physiological changes in an organism that lead to senescence, or a decline of biological functions and of the organism's ability to adapt to metabolic stress.
Aginskoye
former administrative centre of Agin-Buryat autonomous okrug (district), Russia, in the Aga River valley. In 2008 Agin-Buryat merged with Chita oblast (region) to form Zabaykalsky kray (territory). The village was founded in 1811. It has small food-processing industries. Pop. (2002) 11,717.
Agiou Orous, Gulf of
inlet of the Aegean Sea, northeastern Greece. It is the larger and deeper of two gulfs (the other being Ierisou Gulf) that extend into the peninsula of the historical region in Greece known as Macedonia (Makedonia). The silted-up remains of a canal completed by Persian king Xerxes I in 480 ...
Agis I
early Spartan king, traditionally held to be the son of Eurysthenes (in legend, one of the twins who founded Sparta). Because the Agiad line of kings was named after him, Agis was perhaps a historical figure. The 4th-century-BC Greek historian Ephorus attributes to Agis the capture of the city of ...
Agis II
king of Sparta after about 427 BC who commanded all operations of the regular army during most of the Peloponnesian War (431-404) against Athens.
Agis III
Spartan king (338-331) who rebelled unsuccessfully against Alexander the Great.
Agis IV
Spartan king (244-241) who failed in his attempt to reform Sparta's economic and political structure.
agitprop
political strategy in which the techniques of agitation and propaganda are used to influence and mobilize public opinion. Although the strategy is common, both the label and an obsession with it were specific to the Marxism practiced by communists in the Soviet Union.
Aglauros
in Greek mythology, eldest daughter of the Athenian king Cecrops. Aglauros died with her sisters by leaping in fear from the Acropolis after seeing the infant Erichthonius, a human with a serpent's tail. The Roman poet Ovid (Metamorphoses Book II), however, related that Aglauros was turned to stone by the ...
Agnano
volcanic crater, Napoli provincia, Campania regione, southern Italy. It is situated in the Campi Flegrei volcanic region just west of Naples. The crater, about 4 miles (6 km) in circumference, was known to the Greeks and Romans for its hot springs and the six-story Thermae Anianae ("Thermal Baths") built for ...
agnathan
any member of the group of primitive jawless fishes that includes the lampreys (order Petromyzoniformes), hagfishes (order Myxiniformes), and several extinct groups.
Agnelli, Giovanni
founder of the Fiat (Fabbrica Italiana Automobili Torino) automobile company and the leading Italian industrialist of the first half of the 20th century.
Agnelli, Giovanni
chairman of the automobile manufacturing company Fiat SpA, Italy's largest private business enterprise, from 1966 to 2003.
Agnelli, Umberto
Italian automotive executive and grandson of Giovanni Agnelli, the founder of Fiat SpA. He served as the company's chairman from 2003 to 2004.
Agnes Grey
novel by Anne Bronte, published in 1847. The strongly autobiographical narrative concerns the travails of a rector's daughter in her service as governess, first to the unruly Bloomfield children and then to the callous Murrays. Her sole consolations in an otherwise dreary and constricted life are the natural environment and ...
Agnes of Poitou
second wife of the Holy Roman emperor Henry III. She was regent (1056-62) during the minority of her son, the future Henry IV.
Agnes Scott College
private institution of higher education for women in Decatur, Georgia, U.S. A liberal arts college allied with the Presbyterian Church (U.S.A.), Agnes Scott College offers Bachelor of Arts degrees in some 30 disciplines; several interdisciplinary majors are offered as well, including art history-Bible and religion, art history-English literature, biology-psychology, international ...
Agnes, Saint
virgin and patron saint of girls, who is one of the most celebrated Roman martyrs.
Agnesi, Maria Gaetana
Italian mathematician and philosopher, considered to be the first woman in the Western world to have achieved a reputation in mathematics.
Agnew, Spiro T.
39th vice president of the United States (1969-73) in the Republican administration of President Richard M. Nixon. He was the second person to resign the nation's second highest office (John C. Calhoun was the first in 1832) and the first to resign under duress.
Agni
(Sanskrit: "Fire"), fire-god of the Hindus, second only to Indra in the Vedic mythology of ancient India. He is equally the fire of the sun, of lightning, and of the hearth that men light for purposes of worship. As the divine personification of the fire of sacrifice, he is the ...
Agnihotri, Shiv Narayan
Hindu founder of an atheistic society called Deva Samaj ("Society of God").
Agnon, S.Y.
Israeli writer who was one of the leading modern Hebrew novelists and short-story writers. In 1966 he was the corecipient, with Nelly Sachs, of the Nobel Prize for Literature.
agnosia
loss or diminution of the ability to recognize objects, sounds, smells, tastes, or other sensory stimuli. Agnosia is sometimes described as perception without meaning. It is often caused by trauma to or degeneration of the parts of the brain involved in the integration of experience, perception, and memory. Examples of ...
agnosticism
(from Greek agnostos, "unknowable"), strictly speaking, the doctrine that humans cannot know of the existence of anything beyond the phenomena of their experience. The term has come to be equated in popular parlance with skepticism about religious questions in general and in particular with the rejection of traditional Christian beliefs ...
Agnostus
genus of trilobites (an extinct group of aquatic arthropods) found as fossils in rocks of Early Cambrian to Late Ordovician age (those deposited from 540 to 438 million years ago). The agnostids were generally small, with only two thoracic segments and a large tail segment. Agnostus itself was only about ...
Agnus Dei
designation of Jesus Christ in Christian liturgical usage. It is based on the saying of John the Baptist: "Behold, the Lamb of God, who takes away the sin of the world!" (John 1:29). In the Roman Catholic liturgy the Agnus Dei is employed in the following text: "Lamb of God, ...
Agobard, Saint
archbishop of Lyon from 816, who was active in political and ecclesiastical affairs during the reign of the emperor Louis I the Pious. He also wrote theological and liturgical treatises.
agon
debate or contest between two characters in Attic comedy, constituting one of several formal conventions in these highly structured plays. More generally, an agon is the contest of opposed wills in Classical tragedy or any subsequent drama.
agonism
survivalist animal behaviour that includes aggression, defense, and avoidance. The term is favoured by biologists who recognize that the behavioral bases and stimuli for approach and fleeing are often the same, the actual behaviour exhibited depending on other factors, especially the distance to the stimulus.
agora
in ancient Greek cities, an open space that served as a meeting ground for various activities of the citizens. The name, first found in the works of Homer, connotes both the assembly of the people as well as the physical setting; it was applied by the classical Greeks of the ...
Agoracritus
Greek sculptor said to have been the favourite pupil of Phidias. His most renowned work is the statue of Nemesis at Rhamnous, Greece, part of the head of which is in the British Museum, while fragments of the pedestal reliefs are in Athens.
Agostino Di Duccio
early Renaissance sculptor whose work is characterized by its linear decorativeness. His early work shows the influence of Donatello and Michelozzo, whom he assisted in adorning SS. Annunziata in Florence.
Agostino Di Giovanni
late Gothic sculptor, best known for his work, with Agnolo di Ventura, on the tomb of Guido Tarlati.
Agoult, Marie de Flavigny, comtesse d'
writer known for her role in and descriptions of Parisian society in the 1840s.
agouti
any of about a dozen species of tropical American rodents resembling the small forest-dwelling hoofed animals of tropical Africa and Asia (see chevrotain; duiker; royal antelope). Agoutis weigh up to 6 kg (13 pounds), with an elongated body measuring up to 76 cm (2.5 feet) long. They have a large ...
AGP
graphics hardware technology first introduced in 1996 by the American integrated-circuit manufacturer Intel Corporation. AGP uses a direct channel to a computer's CPU (central processing unit) and system memory-unlike PCI (peripheral component interconnect), an earlier graphics card standard on which AGP was based. In graphics-intense applications, this direct channel gives ...
Agra
city, west-central Uttar Pradesh state, north-central India. It lies on the Yamuna (Jumna) River about 125 miles (200 km) southeast of Delhi. Founded by Sultan Sikandar Lodi in the early 16th century, it was the Mughal capital during some periods of their empire. In the late 18th century the city ...
Agra Fort
large 16th-century fortress of red sandstone located on the Yamuna River in the historic city of Agra, west-central Uttar Pradesh, north-central India. It was established by the Mughal emperor Akbar and, in its capacity as both a military base and a royal residence, served as the seat of government when ...
Agramonte y Simoni, Aristides
physician, pathologist, and bacteriologist, a member of the Reed Yellow Fever Board of the U.S. Army that discovered (1901) the role of the mosquito in the transmission of yellow fever.