It is a rival , something or someone as an opponent . It is used in anatomy and physiology in pairs of muscles working in opposite directions, in biochemistry for one compound that counteracts the action of another, or in a dramatic work for the character facing another. Although the voice comes to us from a late Latin, the origin is in the Greek 945; 957; 964; 945; 947; 969; 957; 953; 963; 964; 951; 962; ( antagonist ) formed by 945; 957; 964; 953; ( anti "opposite , on the outside") 945; 947; 969; 957; 953; 963; 964; 951; 962; ( agonistés "fighter , who makes an effort" ) .
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