asynchronous

/eɪˈsɪŋkɹənəs/
/eɪˈsɪŋkɹənəs/

adjective

  1. Not synchronous; occurring at different times.

  2. (of a request or a message) Allowing the client to continue during processing.

  3. (communication) Having many actions occurring at a time, in any order, without waiting for each other.

Synonyms: async, asynch, metachronous
Antonyms: synchronous