Definitions from Wiktionary (guerrilla)

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

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