浩劫 (hào jié) is a formal, literary noun meaning 'catastrophe' or 'great calamity' — an event of immense scale and devastating impact, often with profound historical, social, or moral weight. The first character 浩 (hào) means 'vast', 'immense', or 'boundless', evoking magnitude and overwhelming force; the second character 劫 (jié) means 'calamity', 'plunder', or 'disaster', historically linked to Buddhist concepts of cyclical world-ending catastrophes. Together, they intensify each other: not just any disaster, but one of epic, sweeping destruction.

This term is commonly used in historical, political, or philosophical contexts — for instance, referring to wars, famines, or societal collapses — and carries solemn, often somber connotations. It appears frequently in written Chinese (essays, news analysis, literature) but rarely in casual speech. While 劫 alone can mean 'robbery' or 'kidnapping' in modern usage, 浩劫 always retains its grand, tragic sense and never refers to minor misfortunes.