1. Language used in official, professional, or academic contexts with adherence to standard grammar, vocabulary, and conventions
The CEO used formal language in the board meeting presentation.
O CEO usou linguagem formal na apresentação da reunião do conselho.
2. In computing and linguistics, a language defined by formal rules and symbols for mathematical or logical purposes
Regular expressions are part of formal language theory in computer science.
As expressões regulares fazem parte da teoria de linguagem formal na ciência da computação.
3. Language characterized by proper pronunciation, correct grammar, and sophisticated vocabulary
She switched to formal language when speaking with her professors.
Ela mudou para linguagem formal ao falar com seus professores.