Definition from Wiktionary, the free dictionary
Alternative forms 
- aynsch (colloquial)
Audio (UK) (file)
asynchronous (not comparable)
- Not synchronous; occurring at different times.
- (computing, of a request or a message) Allowing the client to continue during processing.
- (computing, communication) Having many actions occurring at a time, in any order, without waiting for each other; the style of communication used by Ajax.