1. U.S. Politics. the use of irregular or obstructive tactics by a member of a legislative assembly to prevent the adoption of a measure generally favored or to force a decision against the will of the majority. an exceptionally long speech, as one lasting for a day or days, or a series of such speeches to accomplish this purpose. a member of a legislature who makes such a speech.
2. an irregular military adventurer, especially one who engages in an unauthorized military expedition into
"orators can be filibustering."
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