Against or in opposition to something; used to show two opposing sides or arguments.
From Latin 'contra' meaning 'against' or 'opposite.' It's been used in English since medieval times as both a prefix and standalone word in legal and philosophical contexts.
When you hear 'pro and contra,' you're using the exact same word ancient Romans used in debates—it's the root of 'contradict,' 'contrary,' and even 'contract,' all building on this idea of 'going against.'
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