What does guerrilla mean?
Guerrilla is most often a noun for an irregular combatant who uses surprise, mobility, and hit-and-run tactics rather than conventional battlefield methods. As an adjective, it describes those tactics or an unconventional approach to a problem. The term can also name the tactic itself, as in “guerrilla marketing,” and rare verb use refers to waging such irregular warfare. Guerrilla carries strong political and military associations, particularly with resistance movements and conflicts over national independence, but it may also describe tactics used by criminals or militant groups. Because the word emphasizes asymmetry—small, unpredictable forces challenging a stronger opponent—it has also become a useful metaphor for creative, disruptive strategies in business, politics, and everyday life. Its Spanish origin and long history as a label for irregular fighters make it both a precise military term and a vivid cultural metaphor.
An irregular combatant who uses surprise, mobility, sabotage, or short attacks to disrupt a stronger opposing force. By extension, it can also denote an indirect or unconventional tactic.
"The guerrilla spent weeks observing the route before attacking the isolated convoy."
The word may refer to a member of an organized resistance movement, an insurgent, or a member of a militant or criminal group, depending on context.
Relating to or employing irregular combat methods characterized by surprise, mobility, and decentralized action.
"The defenders used guerrilla methods to prevent the occupying force from establishing a stable position."
In broader usage, the adjective can describe any notably unconventional, indirect, or disruptive approach.
To engage in guerrilla warfare or operate as an irregular combatant.
"For years, the separatists guerrilled from remote mountain camps."
This is much less common than the noun and adjective forms and may sound marked in informal registers.
The standard plural is guerrillas, with no apostrophe.
"The two guerrillas maintained contact through a network of coded messages."
Guerrilla entered English from Spanish during the age of independence wars, when small, mobile forces discovered that unpredictability could be as powerful as conventional firepower.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does guerrilla come from?
The word entered English from Spanish guerrilla in the early nineteenth century. The Spanish word was formed from guerrero, meaning a warrior or irregular fighter, with the diminutive ending -illa, and ultimately relates to Latin guerra, meaning “war.” Related forms appeared in several Romance languages, including French guerre, Spanish guerra, Portuguese guerreiro, and Italian guerriglia.
Related word forms
How guerrilla is actually used
The word has strong political and military associations and may refer to insurgents, resistance fighters, or members of a non-state armed group. It can also carry a more general modern connotation of an unconventional, disruptive strategy. The verb is comparatively rare and may sound marked in informal use.
Easily confused with guerrilla
Guerilla is an established alternative spelling of the same word, although guerrilla is the preferred modern spelling.
A guerrilla is an irregular combatant, whereas a gorilla is a great ape.