insurgent UK /ɪnˈsəːdʒ(ə)nt/US /ɪnˈsəɹd͡ʒənt/adjective 2noun 1forms 1 adjective2 •Rebellious, opposing authority.The insurgent provinces. — 1856 •Of water: surging or rushing in.Vesuvio groans through all his echoing caves, / And Etna thunders o'er the insurgent waves. — 1791 noun1 •One of several people who take up arms against the local state authority; a participant in insurgency. formsinsurgents