formal language

noun

1. a language designed for use in situations in which natural language is unsuitable, as for example in mathematics, logic, or computer programming. The symbols and formulas of such languages stand in precisely specified syntactic and semantic relations to one another

2. logic a logistic system for which an interpretation is provided: distinguished from formal calculus in that the semantics enable it to be regarded as about some subject matter

Example Sentences

He also speaks in full sentences and uses formal language fitting legal argumentation.

From Slate

“You have very stiff and formal language to Xi Jinping on the occasion of what is actually an historically important event – the 75th anniversary of relations of the People’s Republic of China,” Mr Foster-Carter says.

From BBC

“It was in much more formal language than she had ever used, and it said, ‘What is my visa status’,” she tells the BBC.

From BBC

Closeness erodes formal language, imbues utterances with private meaning.

From New York Times

That is all the more reason that your correspondents may be impressed with the dignity of using formal language.

From Washington Post