from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A martial art and sport of attack and defense, in which competitors wear boxing gloves and throw punches as in boxing and kick with their bare feet as in karate.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hybrid martial art derived from Muay Thai, karate and boxing during the 1960s to 1970s; more generally, any stand-up combat sport that combines kicks and punches.
A 1960s compound of kicking + boxing. Possibly coined as a Japanese anglicism (和製英語), キックボクシング kikkubokushingu by Osamu Noguchi. (Wiktionary)