Meaning of ASYNCHRONOUS in English
The term asynchronous is usually used to describe communications in which data can be transmitted intermittently rather than in a steady stream. For example, a telephone conversation is asynchronous because both parties can talk whenever they like. If the communication were synchronous, each party would be required to wait a specified interval before speaking. Most communications between computers and devices are asynchronous.
DAX English glossary of key connectivity terms. Английский глоссарий основных терминов по коммуникациям DAX. 2012