noun
a particular way of speaking or using words, especially a way common to those with a particular job or interest
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In legal parlance, the term 'plaintiff' refers to the party who brings a case to court.
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In everyday parlance, people often refer to the internet as 'the web'.
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In street parlance, 'lit' means something exciting or amazing.
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In political parlance, 'swamp' is often used to describe a corrupt system.