nuclear option n. especially in politics, an action of last resort; in recent years in the U.S., an extreme method of overcoming a filibuster related to the confirmation of judicial nominees. Editorial Note: This term was not coined by U.S. Senator Trent Lott. According to William Safire, the term goes at least back to the Nixon presidency, when he heard it for the first time from Nixon’s Chief of Staff, Bob Haldeman. (source: Double-Tongued Dictionary)