asynchronous
Technical computing term describing operations that do not require synchronized timing or waiting.
This system processes data asynchronously.
同期式 means 'synchronous', the opposite of 非同期式.
asynchronous transmission
Compound of 非 (hi, 'non-') + 同期 (dōki, 'synchronization') + 式 (shiki, 'method' or 'type').