1) Kc 2) Khz 3) Kilohertz 1) Kilocycle per second 2) Kilohertz 3) Rate 
A kilocycle is a thousand cycles of any periodic phenomenon. This is a measurement of usage of reciprocating machines, especially presses. Kilocycles or kc, as an abbreviation of kilocycles per second, is an old term for what is today known as kilohertz. This is because sound waves have a frequency measurable in their number of vibrations (or cycl...
One thousand cycles per second. ... (05 Mar 2000) ... 
(kc) Type: Term Pronunciation: kil′ō-sī′kĕl Definitions: 1. One thousand cycles per second.
a unit equal to 1000 cycles: used esp. in radio as 1000 cycles per second for expressing the frequency of electromagnetic waves; kilohertz. The term kilohertz is now preferred in technical use. Abbr.: kc