Parlance (noun)

1. A particular way of speaking or using words, especially within a particular profession or group.
2. A particular language or idiom.

Origin:

Late 16th century: from french parler "to speak", from latin parabolare "to talk in comparison", from parabola "comparison".

Examples:

1. The financial parlance is hard to understand.
2. He spoke in the parlance of the street.
3. The legal parlance is filled with jargon and Latin phrases.
4. The parlance of the internet is constantly evolving.
5. The parlance of the business world is different from the parlance of everyday life.