filibusterism|fɪlɪˈbʌstərɪz(ə)m| [f. filibuster n. + -ism.] The practice of filibustering; inclination to, or tendency to support, filibustering. 1862J. Spence Amer. 74 Filibusterism is another branch of the same tree [as Repudiation].1880American XII. 361 Filibusterism had excited the troubles.