noun
A soldier in a small independent group, fighting against the government or regular forces by surprise raids.
(now rare) A non-official war carried out by small independent groups; a guerrilla war.
A marketer who uses guerrilla marketing techniques.
A maker of guerrilla television.
adjective
(military) Relating to, using, or typical of guerrilla warfare, or its principles of small independent or non-official perpetrators.
(marketing) Relating to, using, or typical of guerrilla marketing.
Using unconventional, non-traditional, non-mainstream and often subversive practices to achieve something.