<p><strong>Noun</strong></p><ul><li>A member of a band of irregular soldiers that uses guerrilla warfare, harassing the enemy by surprise raids, sabotaging communication and supply lines, etc.</li></ul><p><strong>Adjective</strong></p><ul><li>Pertaining to such fighters or their technique of warfare: guerrilla tactics, guerrilla strongholds, guerrilla tactics.</li><li>Of or relating to an unauthorized, edgy, or disruptive version of an activity: guerilla gardening to beautify an abandoned lot, guerrilla filmmaking on a busy sidewalk.</li></ul>