IPA: /əˈsɪŋkrənəsli/
KK: /ə'sɪŋkrənəsli/
In a way that does not happen at the same time or in a synchronized manner.
The data was processed asynchronously, allowing other tasks to run simultaneously.
Asynchronously → It is formed from "a-" (meaning not) and "synchronos" (from Greek, meaning occurring at the same time). The word describes events that do not occur at the same time, hence the meaning of not being synchronized.
Think of 'not' ('a-') happening 'at the same time' ('synchronos') — that's why asynchronously means events that do not happen together.