The same speaker writes a legal brief and chats with friends in noticeably different language. Register is a variety of language associated with a particular situation, purpose, or occupational domain, marked by distinctive vocabulary, grammar, and discourse patterns.

Formal and informal registers differ in explicitness, contraction, and address terms. Technical registers pack specialized terminology. Speakers shift registers as context changes, showing communicative competence beyond basic grammar.

Register analysis informs language teaching for specific purposes and explains why some texts feel appropriate or jarring. Corpus studies quantify register features across large collections. Awareness of register reduces pragmatic failure in professional and cross-cultural settings.

• Situational variety of language use
• Marked by vocabulary, grammar, and structure
• Shifts with purpose and audience
• Important in professional and educational communication