| agon | (noun) a festivity in ancient Greece at which competitors contended for prizes | - |
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| agonist | (noun) (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction | - |
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| (noun) a muscle that contracts while another relaxes | - |
| (noun) someone involved in a contest or battle (as in an agon) | - |
| (noun) the principal character in a work of fiction | Synonyms: protagonist |
| agony | (noun) intense feelings of suffering; acute mental or physical pain | Synonyms: torment, torture |
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| (noun) a state of acute pain | Synonyms: excruciation, suffering |
| agora | (noun) 100 agorot equal 1 shekel in Israel | - |
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| (noun) a place of assembly for the people in ancient Greece | Synonyms: public square |
| (noun) the marketplace in ancient Greece | - |
| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agouti | (noun) agile long-legged rabbit-sized rodent of Central America and South America and the West Indies; valued as food | Synonyms: Dasyprocta aguti |
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