The definition of a weapon is a tool used to injure or kill in fighting or hunting.(noun)
An example of a weapon is a gun.
See weapon in Webster's New World College Dictionary
Origin: ME wepen < OE wæpen, akin to Ger waffe, ON vāpn, Goth wēpna: base found only in Gmc
See weapon in American Heritage Dictionary 4
Origin: Middle English wepen
Origin: , from Old English wǣpen.
Learn more about weapon