The tactics, strategy, or ideological commitment to guerrilla warfare and unconventional military methods.
From 'guerrilla' (a small irregular military unit) plus the suffix '-ism'. 'Guerrilla' itself comes from Spanish 'guerra' (war) with the diminutive suffix '-illa'.
This word emerged in the mid-20th century as political theorists started analyzing how small groups could challenge larger armies—it became central to discussions of revolution and colonial resistance.
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