| gigahertz | (n) 1, 000, 000, 000 periods per second, Syn. Gc, gigacycle per second, gigacycle, GHz |
| hertz | (n) the unit of frequency; one hertz has a periodic interval of one second, Syn. cycle, cycle per second, Hz, cycles/second, cps |
| kilohertz | (n) one thousand periods per second, Syn. kc, kHz, kilocycle, kilocycle per second |
| megahertz | (n) one million periods per second, Syn. megacycle per second, megacycle, Mc, MHz |