| Subject | English | Japanese |
| gen. | n around-the-clock system | 二十四時間制 news1 nf08 |
| tech. | master and secondary clock system | 親子式電気時計 (おゃこしきでんきとけい) |
| comp., MS | system clock | システム クロック (The electronic circuit in a computer that generates a steady stream of timing pulses--the digital signals that synchronize every operation. The system clock signal is precisely set by a quartz crystal, typically at a specific frequency between 1 and 50 megahertz. The clock rate of a computer is one of the prime determinants of its overall processing speed, and it can go as high as the other components of the computer allow) |
| comp. | n system clock | システム・クロック |
| comp. | n system clock | システムクロック |