Advantages, benefits, or positive aspects of something. Also short for professionals, meaning experts or people skilled in a particular field.
Short for 'professional' when referring to experts, or from Latin 'pro' meaning 'for' or 'in favor of' when listing advantages. The 'pros and cons' usage comes from Latin 'pro et contra' (for and against).
The phrase 'pros and cons' is a perfect example of how Latin still lurks in our everyday speech! We're literally saying 'for and against' in Latin every time we weigh advantages and disadvantages, showing how ancient Roman rhetorical practices still shape how we organize our thinking.
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