When you define war, do you mean a group of people against another group? A single hand-to-hand combat between two individuals could be considered a war (as in 2a below). Many here study martial arts under the definition of 1b.
To claim what people study is not a martial art is narrowing your scope/definition rather restrictively.
- Ceicei
From Merriam-Webster dictionary:
Main Entry: 1war
Pronunciation: 'wor
Function: noun
Usage: often attributive
Etymology: Middle English werre, from Old North French, of Germanic origin; akin to Old High German werra strife; akin to Old High German werran to confuse
1 a (1) : a state of usually open and declared armed hostile conflict between states or nations (2) : a period of such armed conflict (3) : [SIZE=-1]STATE OF WAR[/SIZE] b : the art or science of warfare c (1) obsolete : weapons and equipment for war (2) archaic : soldiers armed and equipped for war
2 a : a state of hostility, conflict, or antagonism b : a struggle or competition between opposing forces or for a particular end <a class war> <a war against disease> c : [SIZE=-1]VARIANCE[/SIZE], [SIZE=-1]ODDS [/SIZE]3
- war·less /-l&s/ adjective
To claim what people study is not a martial art is narrowing your scope/definition rather restrictively.
- Ceicei
From Merriam-Webster dictionary:
Main Entry: 1war
Pronunciation: 'wor
Function: noun
Usage: often attributive
Etymology: Middle English werre, from Old North French, of Germanic origin; akin to Old High German werra strife; akin to Old High German werran to confuse
1 a (1) : a state of usually open and declared armed hostile conflict between states or nations (2) : a period of such armed conflict (3) : [SIZE=-1]STATE OF WAR[/SIZE] b : the art or science of warfare c (1) obsolete : weapons and equipment for war (2) archaic : soldiers armed and equipped for war
2 a : a state of hostility, conflict, or antagonism b : a struggle or competition between opposing forces or for a particular end <a class war> <a war against disease> c : [SIZE=-1]VARIANCE[/SIZE], [SIZE=-1]ODDS [/SIZE]3
- war·less /-l&s/ adjective