IPA: /nɒnˈsɪŋkrənəs/
KK: /nɑnˈsɪŋkrənəs/
Not occurring at the same time or rate; not synchronized.
The nonsynchronous operation of the machines caused delays in production.
Nonsynchronous → It is formed from "non-" (meaning not) and "synchronous" (from Greek "synchronos", meaning occurring at the same time). The word "nonsynchronous" means not occurring at the same time or out of sync.
Think of 'non-' meaning not, and 'synchronous' meaning at the same time — so nonsynchronous describes things that are not happening together.