asynchronous

Etymology

a- + synchronous

adj

1. Not synchronous; occurring at different times.
   These cyberforums are asynchronous; that is, contributors post (i.e., publish a text message) without the need for fellow communicants to be online at the same time. 2013, Al Cooper, Sex and the Internet: A Guide Book for Clinicians, page 215
2. (computing, of a request or a message) Allowing the client to continue during processing.
3. (computing, communication) Having many actions occurring at a time, in any order, without waiting for each other.