actually... martial art pertains to a millitary art, or tightly regimented skill.
so technically speaking, only a few arts that have been used as part of millitary training can be called a true martial art.
then theres the difference between a combat art, thats easily defined as a millitary art... and a sport.
kenjutsu ----> kendo
Ju-Jutsu ----> judo
then theres the fact that most people consider anything based in fighting as a martial art, as long as its oriental.
as far as im concerned... most things fall into one of a few catogorys.
combat art. (ju-jutsu, etc)
sport art (TQD, judo, etc)
art, art. (tai chi, wushu, etc)
weapon art. (kenjutsu, sojutsu, etc)
the rest is just details, and semantics.
God i LOVE these things.
Im not sure what weapons will be used to fight WWIII, but i know that WWIV will be waged with wooden sticks.