1. Taking immediate advantage, often unethically, of any circumstance of possible benefit
   - opportunist, opportunistic

See also: expedient

• Aristolochiales
• Aristopak
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• Aristotelia
• Aristotelia racemosa
• Aristotelia serrata
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• Aristotle
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• arithmetic
• arithmetic mean
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• arithmetician
• arity
• Arius
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• Arizona cypress