Nouns starting with A

• Acocanthera oppositifolia — Noun – English ～ evergreen shrub or tree of South Africa
• antipodal opposition — Noun – English ～ the relation of opposition along a diameter
• all-or-none law — Noun – English ～ (neurophysiology) a nerve impulse resulting from a weak stimulus is just as strong as a nerve impulse resulting from a strong stimulus
• Agent Orange — Noun – English ～ a herbicide used in the Vietnam War to defoliate forest areas
• Association of Orangemen — Noun – English ～ a Protestant political organization in Northern Ireland
• apple orchard — Noun – English ～ a grove of apple trees
• animal order — Noun – English ～ the order of animals
• Augustinian order — Noun – English ～ any of several monastic orders observing a rule derived from the writings of St. Augustine
• aktivt ordforråd — Noun – Danish ～ den mængde ord som en person bruger
• American organ — Noun – English ～ a free-reed instrument in which air is drawn in through reeds by suction bellows
• autotrophic organism — Noun – English ～ plant capable of synthesizing its own food from simple organic substances
• Abu Nidal Organization — Noun – English ～ a Palestinian international terrorist organization that split from the PLO in 1974; has conducted terrorist attacks in 20 countries; "in the 1980s the Fatah-RC was considered the most dangerous and murderous Palestinian terror group"
• American Federation of Labor and Congress of Industrial Organizations — Noun – English ～ the largest federation of North American labor unions; formed in 1955
• Anomala orientalis — Noun – English ～ introduced into United States from the Orient; larvae feed on roots of sugarcane and other grasses
• application-oriented language — Noun – English ～ a language whose statements resemble terminology of the user
• aortic orifice — Noun – English ～ the orifice from the lower left chamber of the heart to the aorta
• American oriole — Noun – English ～ American songbird; male is black and orange or yellow
• Alpha Orionis — Noun – English ～ the second brightest star in Orion
• architectural ornament — Noun – English ～ (architecture) something added to a building to improve its appearance
• Armenian Apostolic Orthodox Church — Noun – English ～ an independent Christian church established in Armenia since 300; was influenced by both Roman and Byzantine traditions

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