transact

Transact is a verb meaning to carry out or conduct business, a financial deal, or formal negotiations. It can refer to performing a transaction, exchanging goods or services for money, or settling a matter through agreement. In finance and commerce, to transact commonly appears in phrases like "transact business with a supplier" or "transact a sale." The noun form is transaction; the adjective form is transactional.

The word derives from Latin transactus, the past participle of transagere and related to transigere, meaning to settle, complete, or conduct. Through Old French and Middle English it developed the general sense of performing or handling business or negotiations.

In computing, transact is used in the context of transactions in databases and software systems. A transaction is a unit of work that must be completed in full or not at all, maintaining properties such as atomicity, consistency, isolation, and durability (ACID). In this sense, software may "commit" or "roll back" a transaction to ensure data integrity during operations that span multiple steps.

Usage notes: Transact tends to imply formality and intentionality, often in business, legal, or technical contexts. It is less common in casual conversation, where "do business" or "negotiate" may be preferred. See also: transaction, transaction processing, ACID.