Gedan (下段), meaning roughly `lower level`, is one of the three heights commonly referred to in Japanese martial arts. It refers specifically to the lower part of the body, from the belt on the karategi and below. ... Found on http://en.wikipedia.org/wiki/Gedan
Lower section. During the practice of KIHON IPPON KUMITE (one step basic sparring), the attacker will normally announce where he/she will attack JODAN, CHUDAN, or GEDAN (Upper level, Mid-level, or lower level). Found on http://www.jkra.com/karate_glossary.htm