noun
In computing, a master clock provides the primary timing signal for synchronizing other components or systems.
主刻時機構はシステム全体のタイミングを制御する。
The master clock controls the timing of the entire system.
Compound of 主 (main), 刻時 (timekeeping), and 機構 (mechanism). The exact derivation is uncertain; it is a technical term likely coined in computing contexts.