asynchronous
Technical computing term describing operations that do not require synchronized timing or waiting.
このシステムは非同期式でデータを処理する。
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').