1. instances of buying or selling something; business deals or exchanges
Usage: business; finance
2. formal communications or dealings between people or groups
Usage: formal
3. published reports of proceedings at meetings of a learned society
Usage: academic; formal

Examples

• The bank recorded all financial transactions automatically.
• Credit card transactions are processed within seconds.
• The company’s transactions with overseas suppliers increased this year.
• All business transactions must be documented properly.
• The real estate transactions were completed by Friday.
• Digital transactions have replaced many cash payments.
• The transactions of the Royal Society were published annually.